Welcom to Holy Feather
1. Power can be supplied using a Micro USB phone charger, a 3.7-4.2V lithium battery, or a 3.7-24V DC power supply. Choose one of the three options.
2. Short circuit the "on/off contact" for 2 seconds to set the decoding board on/off. For battery powered situations, shutting down when not in use is more energy-efficient and convenient for modification.

Operating instructions
After turning on the power, the blue indicator light flashes quickly and enters Bluetooth mode; After broadcasting the "prompt sound", enter pairing mode and wait for pairing; Search for "XFY-WRBT" (amplifier board device name) through Bluetooth on the mobile phone, connect "XFY-WRBT", and play a "prompt sound" after successful connection. The indicator light will stay on to play mobile music. When playing music, the indicator light will flash slowly; After Bluetooth disconnection, the amplifier board is ready for the next pairing and plays a "beep" to enter pairing mode and wait for pairing.

Precautions for using a 3.7V lithium battery for power supply
When using battery power, if the battery voltage is lower than 3.3V, the decoding board will automatically shut down. After re charging or fully charging, short circuit the on/off contacts for 2 seconds to start up.
When using a battery for power supply, if the battery voltage is too low, there may be "sizzling" noise, in which case the battery needs to be charged.
3. As there is no designed lithium battery charging protection circuit on the decoding board, it is recommended to use lithium batteries with built-in protection boards.
If your rechargeable battery supports Micro USB direct charging, you can use Micro USB to charge the battery directly.