GTD Audio 4x800 Adjustable Channels UHF Diversity Wireless Cordless Handheld Microphone Mic System Ideal for Church, Karaoke, Dj Party, Range 450ft (4 Handheld Mics)

800 Selectable frequencies on each channel, up to 20 sets can be worked at the same time, True diversity operation for increased range/reliability, reducing dropouts., Automatic frequency scanning to find and set the most interference-free channel in the area, Automatic transmitter setup, the channel of the transmitter and receiver can easily synchronize, Range: Up to 450 feet ( 150 meters ) Frequency: UHF 550MHz - 590MHz ( programmable )