Item Type: BT Sound Receiver BoardMaterial: PCBColor: WhiteBT Version: V5.0 (Chip: JL6925A)Transmission Distance: Approx. 15m/49.2ftPower Supply: USB Power Supply (Universal for Micro USB 5V Power Supply), 3.7-5V Power Supply Pad (to realize external 3.7-5V lithium battery power supply modification)3.5mm stereo sound interface: standard 3.5mm/0.1in interface, output stereo sound source, can be inserted into headphones, connected to power amplifiers and other equipmentTransmission Protocol: A2DP, AVCTP, AVDTP, HFPSNR: 90DBTHD + N: -70DBCrosstalk: -86dbDNR: 91dbPairing Instructions: connect the power supply, the blue indicator light flashes, and enter the BT mode; when you hear the voice broadcast "The BT device is prepare to pair", it means entering the BT mode and waiting for pairing; after the mobile phone BT searches for "JH BT", click connect. When you hear the voice broadcast "The BT device is connected successfully",It means that the decoder board is successfully connected to the mobile phone, the blue indicator light is long on, and the music can be played, and the blue indicator light is flashing at this time.Package List1 x BT Sound Receiver Board1[Lossless Compatible] MP3 BT 5.0 sound decoder board, WAV+APE+FLAC+MP3 lossless decoding, stereo output, 15m long distance transmission in barrier free environment, BT 5.0 is backward compatible with BT 4.2, 4.1, 4.0. 2[Charge And Discharge] It has the function of charge and discharge, and can be powered by USB power supply. If the USB is suddenly disconnected during charging and playback, the BT will automatically restart, automatically connect and maintain the previous playback state. 3[LED Indicator] Single USB power supply, the red light is flashing, the power supply is normal; single battery power supply, the yellow light is always on, the power supply is normal; the light is flashing, it is charging, the red light is always on, it is fully charged. 4[Call Function] After connecting to BT, turn on the call sound mode in the BT settings. If a call comes in, you can answer or hang up by pressing the PLAY and STOP keys (this module does not have a microphone). 5[Use Of Sound Card] Tin the pads of the two boxes corresponding to the sound card on the back of the module, and connect it to the USB port of computer through a USB cable, then it can be used as a sound card, and the playing sound is output through the module stereo interface.