BT 4.2 Audio Receiver Wireless Audio Receiver Board Stereo Lossless Sound for Home for Car Feature: 1. BT decoding power amplifier board can support BT 4.2 version, support automatic connection function. 2. Stereo Class D power amplifier module, maximum output 5W+5W, can be connected to two 406083w (5W) speakers. 3. BT decoding power amplifier board can realize external 3.7?5v lithium battery power supply modification. 4. Easy to use, no complicated steps are required. After turning on the BT and performing simple operations, you can connect. 5. Small size, light and portable, noise reduction, good playback sound quality, stereo sound. Specification: Item Type: Wireless Audio Receiver Board Power Supply: 3.7-5V Signal to Noise Ratio: 90DB Total Harmonic Distortion + Noise: -70DB Crosstalk: -86DB Noise Reduction: 91DB Support Configuration File: A2DP / AVCTP / AVDTP / AVRCP / HFP Line of Sight: >Approx. 15m / 16.4yd Detailed Description of the Interface: 5V USB Power Supply: Universal Micro USB 5V Power Supply 3.7-5V Power Supply Pad: Realize the External 3.7-5V Lithium Battery Power Supply Modification LED Indicator: Blue Light in BT Mode is On 3.5mm Audio Interface: Standard 3.5mm Interface, Output Stereo Sound Source, Can Insert Earphones, Connect Power Amplifier and Other Equipment Left Channel 5W Output: Decoder Board Left Channel 5W Power Amplifier Output, Connected to 4? 6? 8 3W (5W) Speaker Right Channel 5W Output: Decoder Board Right Channel 5w Power Amplifier Output, Connected to 4? 6? 8 3W (5W) Speaker Package List: 1 x Wireless Audio Receiver Board Note: 1. The decoder board is powered by 3.7?5V, and the chip will be burnt if it is higher than 5.5V. Do not connect the positive and negative poles of the power supply reversely, which will burn the chip. 2. It is recommended that the DC power supply is 5V 1A, if the power supply is insufficient, the sound of the speaker will be small, and the speaker will make a "tick" sound when the power supply is severely insufficient, or even no sound. 3. It is recommended to connect 2 channels of 4 ohm 3W (5W) speakers, if 2 ohm speakers are connected, the power amplifier chip will heat up, causing the chip to burn. 4. Static electricity protection, dry weather is prone to static electricity. During the user's use, please use a conductor to release the static electricity on your hands before operating the decoder board to prevent the decoder chip from being destroyed by static electricity. 5. During use, the mobile phone and the BT decoder board must not be blocked by obstacles such as wall, and try to stay away from the metal shielding, obstructions will reduce the transmission distance, and in serious cases, there will be problems with playing music jams and intermittent, you can adjust the decoder board and The angle of the phone to adjust the best connection signal.