UHF True Diversity Wireless Microphone, UHF 610-690MHz frequency range, 60MHz bandwidth, supports the simultaneous use of 40pcs transmitters, Up to 300m line-of-sight operating range, LL Synthesized circuit, and pre-set 6000 selectable frequencies, Supports the antenna signal bridge function between receivers, 2 hand-held mic transmitters included Designed for professional stage performance and long-distance scenes.