1. Check whether the microphone battery is charged, replace the battery or charge it if it is dead

2. Check whether the microphone volume is turned up,

3. Microphone frequency matching, if there is a lock screen, long press the switch and up button, when the ID word appears, let go of the defrequency and then pair the frequency

. Force frequency matching, turn on the microphone and press and hold the "↑" button, hold it without letting go, turn off the speaker after displaying "SEL", wait for the microphone to show two levers "--" and then turn on the speaker and let go to complete the frequency matching

5. If there is signal interference nearby, the frequency adjustment needs to be staggered

. Test a wired microphone to eliminate the problem of failure of the microphone and the microphone plate itself