Fangrui Product Details Features: 1. Low Power Lossless Dual-channel Stereo Bluetooth 4.2 Module 2. High-end 5w Audio Power Amplifier Chip. 3. Lead Out The Main Pins (previous Song, Next Song, Mute, Shutdown) To Facilitate External Device Control. 4. Working Voltage 5v 5. The 5w Bluetooth Power Amplifier Module Uses A Low-power Lossless Dual-channel Stereo Bluetooth 4.2 Module And A 5w Power Amplifier Chip To Quickly Realize Wireless Audio Playback. Description: Instructions For Use 1. Connect Speakers Or Speakers To Ls1 And . L Is The Left Channel And R Is The Right Channel. 2. Connect The 5v Power Supply Through The Terminal Block Or Android Usb Interface, And The Red Led Light Light Up. Open Your Phone And Search For Bluetooth. Bt-audio Is The Bluetooth Name Of The Module. Click Connect To Pair. After Successful Pairing, A Beep Sound. Then You Can Through The Music App. 3. The Sound Volume Can Be Adjusted Through The Dial Potentiometer. Long The S1 Button To Turn On And Off, And Short To Pause And Start Playback When Blueto