The audio receiver has bluetooth-compatible 5.0 chip, which has stereo sound.It supports bluetooth-compatible 4.1 and automatic back connection function.It supports WAV, APE, FLAC and MP3 lossless decoding and stereo output.Pairing Instructions: When connected the power, the blue indicator light flashes, and enter the bluetooth-compatible mode; When you hear the voice announcement "The bluetooth-compatible device is ready to pair", it means you enter the bluetooth-compatible mode and wait for pairing; After the mobile phone bluetooth-compatible searches for "JH-BT", Click Connect. When you hear the voice broadcast "The bluetooth-compatible device is connected successfully", it means that the decoder board is successfully connected to the mobile phone, and the blue indicator light is on, and the music can be played, and the blue indicator light flashes.Item Name: Audio Receiver ModuleMaterial: PVCBluetooth Version: 5.0Audio Plug: 3.5mmUSB Power Supply: Micro-USB 5VFeatures: Mini, with LED, StereoSize: 30mm x 30mm x 0.3mm/1.18" x 1.18" x 0.01" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Audio Receiver Module