Solution:
Press and hold the power button for 2 seconds to turn on the device, and press and hold the power button for 2 seconds to turn off the device when it is on. If the battery is below 20%, the voice message will be "Low battery, please charge". Press and hold the power button for 5 seconds to reset the power on when it is switched off. The microphone has a battery protection function. The microphone has a battery over discharge protection function, when the microphone indicates low battery, it needs to be charged normally. The microphone will automatically switch off if it reaches the battery's over-discharge voltage. It takes about half an hour or more to charge.