2.4GHz Wireless Microphone System. B-3 PLUS uses our newest 2.4GHz wireless algorithm to your XLR dynamic microphone. Plug TX to your mic, RX to PA system, and you are good to play. The auto paired with 6 channels scanning can avoid Wi-Fi interference and make it simple to use! Plug it, turn it on, B-3 PLUS makes it easy to everyone to embrace great wireless microphone sound.