This product adopts Bluetooth 5.0 main control chip, JL6925A, true stereo 5.0 chip. good sound quality Support automatic connection function, support WAV+APE+FLAC+MP3 lossless decoding, stereo output. Parametric properties Power supply: 3.7-5V to-noise ratio: 90dB Total Harmonic Distortion + Noise: -70dB Crosstalk: -86dB DNR: 91 dB Support profiles: A2DP/AVCTP/AVDTP/AVRCP/HFP Sight distance: 15m Size: 30mm*30mm Interface details USB power supply: Universal Micro USB 5V power supply, 3.7-5V power supply pad, realize external 3.7-5V lithium battery power supply modification LED indicator: blue light on in bluetooth mode 3.5mm stereo audio interface: standard 3.5mm interface, output stereo sound source, can be inserted into headphones, connected to power amplifiers and other equipment Pairing instructions: turn on the power, the blue indicator flashes, and enter the Bluetooth mode; when you hear the voice prompt of "Bluetooth device is ready to pair", it means that you enter the Bluetooth mode and wait for pairing; search for "JH-BT , click Connect. When you hear the voice prompt "Bluetooth device connected successfully", it means that the decoder board is successfully connected to the mobile phone, the blue indicator light is on, music can be played, and the blue indicator light is flashing Package Included: 1*Bluetooth audio connector