Karaoke Machine Bluetooth PA System with 2 Wireless Mics USB/TF/AUX Phone Holder
đ”ăMake It A DuetăLong press the "A= B" key for 2 seconds to switch the "CHA" and "CHB" frequency bands. When the two microphones are in the "CHA" and "CHB" frequency bands respectively, the microphone can be a duo.