1. Wireless microphones are divided into fixed wireless microphones and adjustable frequency wireless microphones. Check the frequency of the microphone.

2. The fixed frequency microphone has no LCD screen, and you can see the frequency of the microphone when you open the back cover of the battery.

3. The adjustable microphone frequency is displayed on the LCD screen, and it can be adjusted to the same frequency after plugging in the device.

4. After plugging in the device, adjust it to the same frequency.