Product Highlights:
1. No annoying POP sounds such as power on, song switching, pause, etc;
2. Wide supply voltage: DC4.5-27V;
3. Two audio input modes: Bluetooth-Compatible mode and LINE IN mode;
4. Two power supply interfaces: terminal block and DC2.1MM socket (compatible with most laptop power interfaces);
5. Power input anti reverse connection function;
6. Acrylic shell protection;

Operating instructions:
1. Mode selection
The module has two modes: Bluetooth-Compatible and LINE IN. When the Bluetooth-Compatible amplifier board is not plugged in with an audio head, it defaults to Bluetooth-Compatible mode when powered on; When the amplifier board is plugged into the audio head, it defaults to LINE IN audio input mode when powered on; You can also switch modes by long pressing the "PLAY/M" key. 2. Connect Bluetooth-Compatible
When switching to Bluetooth-Compatible mode or default Bluetooth-Compatible mode and just powering on, the English message "The Bluetooth-Compatible device is ready to pair" will be displayed, indicating that the device has entered Bluetooth-Compatible mode and is waiting for pairing; The device name of the Bluetooth-Compatible amplifier board found by the Bluetooth-Compatible search on the mobile phone is "XY-BT". When you click connect, the Bluetooth-Compatible amplifier board will prompt "The Bluetooth-Compatible device is connected successfully", indicating that the amplifier board is successfully connected to the mobile phone and can play music.