A: Amplifier Board 1. Power amplifier board size: 8.5x5.2CM 2. Fixed hole distance: 7.9x4.6CM 3.Bluetooth 5.0, support button to turn off / boot, support serial port to change the tone volume and off, power on, no call function, the default volume is the largest 4.TX, RX, GND: TTL serial port confi...
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