This product uses Bluetooth 5.0 main control chip, JL6925A, true stereo 5.0 chip. Good sound qualitySupport automatic connection function, support WAV+APE+FLAC+MP3 lossless decoding, stereo output.Pairing instructions: Connect the power, the blue indicator light flashes, and enter the Bluetooth mode; when you hear the voice broadcast "The Bluetooth device is ready to pair", it means that you enter the Bluetooth mode and wait for pairing; after the mobile phone Bluetooth searches for "-BT", Click Connect. When you hear the voice broadcast "TheBluetooth 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 flashescolour:WhiteMaterial:ABSSize: 30 x 30mmPackage Contents:1 x Bluetooth Audio Receiver boardOnly the above package content, other products are not included.Note: Light 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.