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Omnidirectional, any angle can trigger
   This switch is suitable for small current trigger circuit
   Working voltage: 3.3V ~ 5V
   Digital switch output (0 & 1)
   Material: PCB
   Dimensions: 0.94 x 0.59 x 0.35inch (2.4 x 1.5 x 0.9cm)
   Component model: SW-18015P
   1 X KY-002 Vibration Switch Module

parameter:
Output: 12V, input voltage: DC16-90V.
Output: 5V, input voltage: DC8V-90V.
Output current: 2A (maximum), the real working current is determined by the load, as long as it does not exceed the maximum 2A that the module can withstand.
Quiescent current: 0.6ma (minimum), specifically related to the input voltage.
Efficiency: up to 95% .
Weight: 7g.
Size: 38mm*22mm*14mm.
Scope of application:
It can be used for 12V-91V car power supplies, batteries, and power mobile phones, GPRS, MP3, MP4, etc. The product is small in size, small in ripple, safe, fast and convenient, and can be used for electric vehicles, battery car modification, etc. If you don't understand electronics, please take care to avoid damage to the module!

parameter:
Output: 12V, input voltage: DC16-90V.
Output: 5V, input voltage: DC8V-90V.
Output current: 2A (maximum), the real working current is determined by the load, as long as it does not exceed the maximum 2A that the module can withstand.
Quiescent current: 0.6ma (minimum), specifically related to the input voltage.
Efficiency: up to 95% .
Weight: 7g.
Size: 38mm*22mm*14mm.
Scope of application:
It can be used for 12V-91V car power supplies, batteries, and power mobile phones, GPRS, MP3, MP4, etc. The product is small in size, small in ripple, safe, fast and convenient, and can be used for electric vehicles, battery car modification, etc. If you don't understand electronics, please take care to avoid damage to the module!

1, NE555 chip onboard
2, a single channel output, the output duty cycle square wave is about fifty percent
3, onboard adjustable resistance, resistance can be controlled to adjust the output frequency
4, the working voltage: 5 ~ 12V
5, the board size: 29 (mm) x12 (mm)

Breadboard 830 Point Solderless PCB Bread Board MB-102 MB102 Test Develop DIY

Thread M6 Screw Probe Temperature Sensor Thermocouple K Type Measuring 0-400 Degree 0.5m Cable for PID Controller
Specifications:
Type: K
Screw: M6*1
Cable length: 1m, 2m or other length
Temperature range: 0~400C

Product Description
Electronic Compass Compass Module QMC5883 Triple
Axis Compass Three-axis Magnetic Field Sensor
Description:
*High quality immersion gold pcb machine welding processes, quality assurance
*Name: QMC5883 module (three-axis magnetic field module)
*Model: GY-271
*Chip: QMC5883
*Power supply :3.3-5v
*Means of communication: IIC communication protocol
*Measuring range: ± 1.3-8 Gauss
*chematics, manuals and reference documentation of relevant data
51, the AVR microcontroller test code
Package Includes
 Triple Axis Compass

Product Usage:
1, the meter pulse data sampling
2, fax machine shredder paper detection
3, obstacle detection
4, black and white line detection
product description:
1, using TCRT5000 infrared reflection sensor
2. Detection reflection distance: 1mm~25mm
3, working voltage: 5V
4, the output form: digital signal (0 and 1)
5, with fixed bolt holes for easy installation
6, small board PCB size: 3.5cm x 1cm
7, single weight: 4.5g
8,Build-in TCRT5000 Sensor NSOR
9,Applicable to a variety of platforms including for Arduino / AVR / ARM /PIC
Features:
The infrared emitting diode of the TCRT5000 sensor continuously emits infrared rays. When the emitted infrared rays are not reflected back or reflected back but the intensity is not large enough, the infrared receiving tube is always in the off state, and the output end of the module is low level, indicatingThe diode is always off; when the detected object appears in the detection range, the infrared light is reflected back and the intensity is large enough, and the infrared receiving tube is saturated. At this time, the output end of the module is high, indicating that the diode is illuminated.
Wiring:
1. VCC: Connect the positive pole of the power supply (5V)
2, GND: connected to the negative power supply
3, OUT: high / low level switching signal (digital signal 0 and 1
Package Included:
IR Infrared Line Track Follower Sensor TCRT5000 Obstacle Avoidanc For Arduino

Product Details:
Laser sensor Module
Condition: New
Operating voltage 5V
Output wavelength 650 nm
3 pins module
With fixed bolt hole for easy installation
Color: show as pictures
PLS NOTE that due to lighting effects, monitor's brightness / contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item!
Package Included:
1 x Laser sensor Module

 
  Please read before buying:
Because ordinary parcels do not have tracking information, so encountered the peak season of logistics, ordinary parcels will be extended to arrive, so if you mind the speed of logistics, please pay the registration fee, with faster logistics speed.
When encountering slight product damage, bent pins, and scratches on the case, we will not accept refunds of disputes if they do not affect use . If you mind this situation, please do not purchase my product. When you buy my product, it is the default acceptance of this article! ! !  So we will not accept your dispute.
 
 
1, imported normally open reed switch
2, the comparator output, the signal is clean, the waveform, driving ability, more than 15mA.
3, operating voltage 3.3V-5V
4, the output in the form: Digital switching outputs (0 and 1)
5, a fixed bolt hole for easy installation
6 small board PCB size: 3.2cm x 1.4cm
7, wide voltage LM393 comparator
   Reed switch is an abbreviation of the dry reed contacts a passive electronic switching elements, and has the advantages of simple structure, small size and ease of control, its shell is a sealed glass tube, the tubes are installed two iron elastic reed plate, but also filling called rhodium metal inert gas. In peacetime, the glass tube in the two reeds is made of special materials are separated. When a magnetic substance close to the glass tube, in the role of the magnetic field lines, the pipe within the two reeds are magnetized to attract each other in contact, the reed will suck together, so that the junction point of the connected circuit communication. After the disappearance of the outer magnetic reed because of their flexibility and separate, the line is disconnected. Therefore, as a use of the magnetic field signals to control the line switching device, reed tube can be used as a sensor for counting the number, spacing, etc. (in the security system is mainly used for production of Menci, magnetic window), and also are widely used in a variety of communication devices. In practical use, usually with a permanent magnet control two metal sheet is turned or not, it is also referred to as

Modular features:
1. The high-sensitivity vibration switch produced by our company is adopted, and the SW-18010P vibration sensor is used by default.
2. Comparator output, clean signal, good waveform, strong driving ability, more than 15A
3. Working Voltage 3.3V-5V
4. Output Form: Digital Switch Output (0 and 1)
5. Fixed bolt hole for easy installation
6. PCB Size of Small Plate: 3.2cm x 1.4cm
7. Using a Wide Voltage LM393 Comparator
 
Module wiring instructions:
1. VCC: Connect the positive pole of the power supply
2. GND: Connect power supply negative pole
3.DO: Digital Signal Output
4.AO: This function is invalid with this vibration sensor
 
Module usage instructions:
1. When the product does not vibrate, the vibration switch is in the state of disconnection, the output terminal outputs a high level, and the green indicator does not turn on.
2. When the product vibrates, the vibration switch turns on instantaneously, the output terminal outputs low level, and the green indicator lights on.
3. The output terminal can be directly connected with the single chip computer. The single chip computer can detect the high and low levels, so as to detect whether the environment is shaking and play an alarm role.

1 Way Transmitter specification:
Supply voltage: 5V
Working environment: -25 ~ 85 °
Storage temperature: -30 ~ 100 °
Wavelength: 940nm
Module size: 13.7mm × 27.8mm
Module weight: 1g
Signal type: digital signal
Infrared center wavelength: about 850nm-940nm
Infrared emission angle: about 20 degrees
Infrared emission distance: about 1.3 meters (5V 38Khz)
2 Way Transmitter specification:
Size: 28 * 22mm
Weight: 3g
Voltage: 5V
Port: Digital level
Modulation: Direct transmission No modulation
Launch head: 2
Launch distance: 1-3m
Wavelength: 940nm
Double tube direct launch, through the program to carry out waveform modulation
With the launch signal to indicate the LED, easy to observe the debugging
Applicable to infrared communication, infrared remote control
IR Receivr module  specification :
1. Adopt 1838 remote control receiver with high sensitivity
2. Working voltage 5V
3. Output form: digital output
4. There are 2 fixing holes for easy installation. Aperture 3.1mm
5. With data indicator
6. PCB size: 23.5*21.5mm
Wiring instructions:
1.DAT digital output interface
2.VCC 5V DC power supply positive
3.GND 5V DC power supply negative

Description:
It is a simple interface converter.It includes 4P Terminal,Micro USB female,Type A USB male and Type A USB female.It can achieve mutual conversion between these four interfaces.It can be used as a voltage interface converter or as a data interface converter
Features:
Stable
Multiple interfaces
Small size
Parameters:
Product Name:ZK-USB3 Interface Converter
Product Number:ZK-USB3
Work Voltage:DC 5V
Working Temperature range:-20-85 Celsuis
Working Humidity range:0% -95% RH
Size :32 * 26 mm
Package:
1pcs ZK-USB3 Interface Converter

 
Description:
1.Sensor can sense changes in body angle
2.Adjustable sensitivity (shown in blue digital potentiometer adjustment)
4.Operating Voltage 3.3V-5V
5.Output format: digital switching outputs (0 and 1)
6.With fixed bolt hole for easy installation
7.Small PCB board size: 3.2cm * 1.4cm
8 .Power indicator (red) and the digital switch output indicator (green)
9 .Using LM393 comparator chip, stable
10.Life: at room temperature and normal life of up to 100,000 times switch (times / 1sec).
 
​
Warranty 
 
 
365 days warranty 
Defective items must be reported and returned within the warranty period ( must be in the good condiction) and pls list us for what the defecit is ,also with your order number , so we can repale new items to you within the expired warranty 
 
Payment 
 
We accept Alipay , West Union , TT ,Paypal 
If you submit the order ,pls pay your order timely , so we can prepare and ship out at once 
 
Shipment 
Worldwide shipping 
Orders proecessed within 3 working days after confirm your payment 
We only ship to the address you leave in the order , pls check your receiving address is right 
The images shows are not 100% same as the items you will receive , it is for reference only 
 
Feedback
 
We maintain high standards of excellence and strive for 100% customer satisfaction! 
If you satisfied with our items and service , pls give us a five starts feedback 
Pls contact us to solve the issue before you leave us any negative and netural feedback

Audio Isolation Transformer Features:
Parts Selection: Two independent audio transformers are used, and the transformer material is selected from aerospace materials.
High sensitivity and high reduction, 10-20DB higher sensitivity than similar low-end transformers, full tone, pure sound quality.
Line design: stereo two-channel independent design, circuit board specifications: 45MM X 30MM, very small, suitable
Small cars and other interior installations.
Connection method: Two connection methods, which can be input and output through a 3.5MM headphone jack, or can be directly wired through two blue wiring jacks.
Main function: Eliminate current sound. A common ground-isolated audio transformer eliminates current noise from the AUX common ground. The output and output ground lines are isolated by the transformer and there is no common ground.
Here are some noises and common ground common sense.
What is common land?
This product is an audio common ground isolator, which is effective for the noise caused by the common ground for the audio source and the receiving device.
To put it simply, a common ground is that the ground points of two electrical appliances are not at the same point. Because of the difference in ground resistance, noise is transmitted through the ground wire into the power equipment, forming interference. Because the two devices have different grounding points, common ground noise may occur. In the car audio system, there is an audio interference, which is almost the same as the whistling sound. The frequency of this noise will change with the speed of the engine.
Therefore, this product can only eliminate the noise and current sound caused by the total common-electricity products, and cannot eliminate the noise caused by other reasons. Therefore, you must confirm the source of the noise yourself.
Determine whether the noise is caused by common ground:
1. Use headphones to connect with AUX (3.5mm interface) of car MP3 and car navigation. If there is no noise from the earphone at this time, it can be confirmed that the noise of the car equipment is caused by common ground.
2. Use an audio cable to connect a battery-powered mobile phone or MP3 (note that the mobile phone and MP3 should not be connected to any power supply in the car, such as a telephone) and connect it to the AUX on the center console of the car, and play the music of the mobile phone so that there will be no noise. , you can confirm that the previous noise was caused by a total of land.
3, computer, amplifier, stereo, CD: use passive headphones to plug in the computer to listen to whether there is noise, use the phone plug in the amplifier, audio audition, if you try to hear both without noise, the basic decision is caused by a total of.
4, after the start of the car, the installed amplifier has a current sound, some models will appear more throttle, the greater the current sound, this product can solve this problem.
5, there is a current sound between the amplifier and the speaker or sound, you can install this product between the amplifier and the speaker.
6, laptops connected to the projector at the same time the power amplifier to produce noise, you can use the laptop adapter power supply or battery, then remove the power amplifier noise disappeared, or unplug the projector the same noise disappears, then you can in the computer headphone jack and power amplifier Add a common ground isolator to eliminate noise.

Audio Isolation Transformer Features:
Parts Selection: Two independent audio transformers are used, and the transformer material is selected from aerospace materials.
High sensitivity and high reduction, 10-20DB higher sensitivity than similar low-end transformers, full tone, pure sound quality.
Line design: stereo two-channel independent design, circuit board specifications: 45MM X 30MM, very small, suitable
Small cars and other interior installations.
Connection method: Two connection methods, which can be input and output through a 3.5MM headphone jack, or can be directly wired through two blue wiring jacks.
Main function: Eliminate current sound. A common ground-isolated audio transformer eliminates current noise from the AUX common ground. The output and output ground lines are isolated by the transformer and there is no common ground.
Here are some noises and common ground common sense.
What is common land?
This product is an audio common ground isolator, which is effective for the noise caused by the common ground for the audio source and the receiving device.
To put it simply, a common ground is that the ground points of two electrical appliances are not at the same point. Because of the difference in ground resistance, noise is transmitted through the ground wire into the power equipment, forming interference. Because the two devices have different grounding points, common ground noise may occur. In the car audio system, there is an audio interference, which is almost the same as the whistling sound. The frequency of this noise will change with the speed of the engine.
Therefore, this product can only eliminate the noise and current sound caused by the total common-electricity products, and cannot eliminate the noise caused by other reasons. Therefore, you must confirm the source of the noise yourself.
Determine whether the noise is caused by common ground:
1. Use headphones to connect with AUX (3.5mm interface) of car MP3 and car navigation. If there is no noise from the earphone at this time, it can be confirmed that the noise of the car equipment is caused by common ground.
2. Use an audio cable to connect a battery-powered mobile phone or MP3 (note that the mobile phone and MP3 should not be connected to any power supply in the car, such as a telephone) and connect it to the AUX on the center console of the car, and play the music of the mobile phone so that there will be no noise. , you can confirm that the previous noise was caused by a total of land.
3, computer, amplifier, stereo, CD: use passive headphones to plug in the computer to listen to whether there is noise, use the phone plug in the amplifier, audio audition, if you try to hear both without noise, the basic decision is caused by a total of.
4, after the start of the car, the installed amplifier has a current sound, some models will appear more throttle, the greater the current sound, this product can solve this problem.
5, there is a current sound between the amplifier and the speaker or sound, you can install this product between the amplifier and the speaker.
6, laptops connected to the projector at the same time the power amplifier to produce noise, you can use the laptop adapter power supply or battery, then remove the power amplifier noise disappeared, or unplug the projector the same noise disappears, then you can in the computer headphone jack and power amplifier Add a common ground isolator to eliminate noise.

Type:Audio
Compatible Audio and Video Equipment Style:Player,Earphones and Headphones,Speakers,Professional Audio Equipment,Amplifier,Digital-to-Analog Converter (DAC)
Weight:10g
CHIP:MAX98357
TYPE:CLASS D
colour:purple
Material:Metal pc
Package Contents:
1 * I2S 3W Class D Amplifier
Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is /- 1-3cm.

FT232RL FTDI USB 3.3V 5.5V to TTL Serial Adapter Module forArduin Mini Port     (Buy a good quality Please choose me)
 
Description
100% brand new
Support 3.3V, 5V
chipset FT232RL
USB power has over current protection, using 500MA self-restore fuse
RXD/TXD transceiver communication indicator
Pin definition: DTR,RXD,TXD,VCC,CTS,GND
Pitch:2.54mm
Module size:36mm(length)*17.5mm(width)

Package Included:
1 X GY-BMP280-3.3 Pressure Sensor

STM32G070RBT6 development board minimum system core board learning board replaces STM32F103/070

ESP32 integrates antenna switches, RF balun, power amplifiers, low noise amplifiers, filters and power management modules. The entire solution occupies the smallest printed circuit board area. 2.4 GHz Wi-Fi and Bluetooth dual-mode chip
 
1. The onboard CP2102 stable USB to TTL chip ensures the normal communication of the serial port.
 
2. Support automatic download, no need to switch download and running mode manually.
 
3. Immersion Gold Craft
 
4. Support development on Windows system (cygwin and msys32 simulation environment) and Linux system
 
5. Support ESP32-Ardu
 
 
ESP-WROOM-32 is a general-purpose Wi-Fi BT BLE MCU module with powerful functions and a wide range of uses. It can be used for low-power sensor networks and demanding tasks, such as voice coding, audio streaming, and MP3 Decoding etc.
 
The core of this module is the ESP32-D0WDQ6 chip*, which is scalable and adaptive. The two CPU cores can be individually controlled or powered on. The adjustment range of the clock frequency is from 80 MHz to 240 MHz. The user can cut off the power of the CPU and use the low-power coprocessor to continuously monitor the status changes of the peripherals or whether certain analog quantities exceed the threshold. ESP32 also integrates a wealth of peripherals, including capacitive touch sensors, Hall sensors, low-noise sensor amplifiers, SD card interface, Ethernet interface, high-speed SDIO/SPI, UART, I2S and I2C.
 
 
CPU and memory
ESP32-D0WDQ6 contains two low-power Xtensa® 32-bit LX6 MCUs. On-chip storage includes:
• 448 KB of ROM, used for program startup and kernel function calls.
• 520 KB on-chip SRAM for data and instruction storage.
• The 8 KB of SRAM in RTC, that is, RTC slow memory, can be accessed by the coprocessor in Deep-sleep mode.
• The 8 KB of SRAM in the RTC, that is, the RTC fast memory, can be used for data storage and accessed by the main CPU when the RTC is started in Deep-sleep mode.
• 1 kbit eFuse, of which 256 bits are dedicated to the system (MAC address and chip settings); the remaining 768 bits are reserved for user applications. These applications include Flash encryption and chip ID.
• ESP-WROOM-32 integrates 4MB of SPIFlash

Function:
1, Voice-activated color change: change multiple colors according to music rhythm
2, Touch color change: change color or brightness each time you touch the touch connector
Features:
Universal for cars/automobiles/PC/computer/portable battery with USB surface
LED atmosphere light, decorative light, interior decoration lights, emergency lights, car foot light
Light Color: Colorful
Socket type: USB
Voltage: DC 12V
Rated Power: 1W
Size: Approx. 2.8 x 1 cm
Package Included:
1 x Car LED Atmosphere Lights

Features:
Support Micro SD Card, Micro SDHC card (high-speed card)
The level conversion circuit board that can interface level is 5V or 3.3V
Communication interface is a standard SPI interface
Control Interface: A total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND to ground,
VCC is the power supply, MISO, MOSI, SCK is the SPI bus, CS is the chip select signal pin;
3.3V regulator circuit: LDO regulator output 3.3V as level converter chip, Micro SD card supply;
Level conversion circuit: Micro SD card into the direction of signals into 3.3V, MicroSD card toward the direction of the control interface MISO signal is also converted to 3.3V, general AVR microcontroller system can read the signal;
Micro SD card connector: yes since the bomb deck for easy card insertion and removal.
Positioning holes: 4 M2 screws positioning hole diameter of 2.2mm, easy to install positioning, to achieve inter-module combination;
Specifications:
Power supply:4.5V - 5.5V, 3.3V voltage regulator circuit board
Positioning holes: 4 M2 screws positioning hole diameter of 2.2mm
Control Interface: GND, VCC, MISO, MOSI, SCK, CS

Features:
Support Micro SD Card, Micro SDHC card (high-speed card)
The level conversion circuit board that can interface level is 5V or 3.3V
Communication interface is a standard SPI interface
Control Interface: A total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND to ground,
VCC is the power supply, MISO, MOSI, SCK is the SPI bus, CS is the chip select signal pin;
3.3V regulator circuit: LDO regulator output 3.3V as level converter chip, Micro SD card supply;
Level conversion circuit: Micro SD card into the direction of signals into 3.3V, MicroSD card toward the direction of the control interface MISO signal is also converted to 3.3V, general AVR microcontroller system can read the signal;
Micro SD card connector: yes since the bomb deck for easy card insertion and removal.
Positioning holes: 4 M2 screws positioning hole diameter of 2.2mm, easy to install positioning, to achieve inter-module combination;
Specifications:
Power supply:4.5V - 5.5V, 3.3V voltage regulator circuit board
Positioning holes: 4 M2 screws positioning hole diameter of 2.2mm
Control Interface: GND, VCC, MISO, MOSI, SCK, CS

Features:
Support Micro SD Card, Micro SDHC card (high-speed card)
The level conversion circuit board that can interface level is 5V or 3.3V
Communication interface is a standard SPI interface
Control Interface: A total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND to ground,
VCC is the power supply, MISO, MOSI, SCK is the SPI bus, CS is the chip select signal pin;
3.3V regulator circuit: LDO regulator output 3.3V as level converter chip, Micro SD card supply;
Level conversion circuit: Micro SD card into the direction of signals into 3.3V, MicroSD card toward the direction of the control interface MISO signal is also converted to 3.3V, general AVR microcontroller system can read the signal;
Micro SD card connector: yes since the bomb deck for easy card insertion and removal.
Positioning holes: 4 M2 screws positioning hole diameter of 2.2mm, easy to install positioning, to achieve inter-module combination;
Specifications:
Power supply:4.5V - 5.5V, 3.3V voltage regulator circuit board
Positioning holes: 4 M2 screws positioning hole diameter of 2.2mm
Control Interface: GND, VCC, MISO, MOSI, SCK, CS

3S 12V18650 Lithium Battery Protection Board HX-3S-FL25A-A 11.1V-12.6V with Equalization 25A Over-Current Over-Charge Protection
Product parameters:
Charging voltage: 12.6-13V
Equilibrium current: 45mA
Overcharge voltage range: 4.25-4.35±0.05v
Over-discharge voltage range: 2.3-3.0±0.05v
Upper limit working current: 20-25A (pay attention to heat dissipation)
Upper limit instantaneous current: 35-40A
Quiescent current: less than 30uA
Internal resistance: less than 100mΩ
Effective life: more than 30,000 hours
Short circuit protection: protection, delay self-recovery
Working temperature: -40~ 50  degree
Storage conditions: -40~ 80 degree
The scope of products:
Massager battery pack, LED light backup power supply, 12V electronic products, solar street light battery pack, monitoring standby power supply, and other products.
Test point description: S1 S2 short circuit P P- will output voltage, indicating that all MOS protection is normal, plus a normally open temperature detection can extend the temperature protection.
 

2 Series 18650 battery 6.4V 7.2V Lithium iron phosphateprotection board (board is without balance function.)
A.3.7V li-ion BMS:
7.4V (Li-ion 18650 or li-ion battery rated voltage)
8.4V (Li-ion battery full charge voltage)
7.2V ( Lipo battery pack rated voltage)
B.3.2V Lifepo4 BMS:
6.4V (LiFepo4 18650  battery rated voltage)
7.2V (LiFepo4 battery full charge voltage)
6.2V ( Lipo lifepo4 battery pack rated voltage)
Features:
1) high-accuracy voltage detection circuit;
2) terminal of the charger using high voltage device;
3) Built-in three-stage over-current detection circuit (over-current 1, over-current 2, or load short circuit);
4) MOS transistor can control the battery charge and discharge;
5) low standby current consumption.
Parameter:
Over charge voltage:3.65v±0.05v
Over dishcarge voltage: 2.0-2.5v±0.05v
Max continuous current: 8A
Max peak current: 10A
Working temperature:-40--- 50
Storage Temperature:-40-- 80
Small current:less than 3uA
Life cycle :more than 50000hours
Resistance:Less than 300mΩ
Short cut protection :Protectable,charge can repair
Size: 41*16*3.5mm
2S BMS Cnnection instruction:
B     Connect battery positive;
B-Connect battery negative;
MB  Connect the point between battery1 & battery 2;
P    Charge/discharge positive;
P-     Charge/discharge negative
2S 3P battery building:
2s 4p battery pack building:

2 Series 18650 battery 6.4V 7.2V Lithium iron phosphateprotection board (board is without balance function.)
A.3.7V li-ion BMS:
7.4V (Li-ion 18650 or li-ion battery rated voltage)
8.4V (Li-ion battery full charge voltage)
7.2V ( Lipo battery pack rated voltage)
B.3.2V Lifepo4 BMS:
6.4V (LiFepo4 18650  battery rated voltage)
7.2V (LiFepo4 battery full charge voltage)
6.2V ( Lipo lifepo4 battery pack rated voltage)
Features:
1) high-accuracy voltage detection circuit;
2) terminal of the charger using high voltage device;
3) Built-in three-stage over-current detection circuit (over-current 1, over-current 2, or load short circuit);
4) MOS transistor can control the battery charge and discharge;
5) low standby current consumption.
Parameter:
Over charge voltage:3.65v±0.05v
Over dishcarge voltage: 2.0-2.5v±0.05v
Max continuous current: 8A
Max peak current: 10A
Working temperature:-40--- 50
Storage Temperature:-40-- 80
Small current:less than 3uA
Life cycle :more than 50000hours
Resistance:Less than 300mΩ
Short cut protection :Protectable,charge can repair
Size: 41*16*3.5mm
2S BMS Cnnection instruction:
B     Connect battery positive;
B-Connect battery negative;
MB  Connect the point between battery1 & battery 2;
P    Charge/discharge positive;
P-     Charge/discharge negative
2S 3P battery building:
2s 4p battery pack building:

Description;
DC-DC USB buck charging module (with work indicator, standard contact gold-plated socket)
Compatible phone models: Andrews series, iPhone series, Huawei, millet, . The The
Product Size: 28 * 32 * 8mm
Product weight: 5.5g
Input voltage range: 6-26V
Output voltage: 5.2V (consider the charge line loss, the output is 5.2V or so, the load side is about 5V)
Output current: 3A (in the absence of heat sink device, the stable output current is 2A)
Note 1: positive and negative can not be reversed, and the input voltage can not exceed 26V, otherwise it will lead to chip damage!
Note 2: When working in power, you can not touch the circuit board on the sampling resistor, IC pin, otherwise it may lead to damage to the output voltage of the device!
For some of the poor electronic base customers say: Do not think the nominal 3A current will burn the phone burn equipment! Charging current is determined by the phone or equipment! Most mobile phone charging current is 0.8-1.5A.
Package  Included:  
1 x  Step Down Buck Module