GTD Audio 4x800 Adjustable Channels UHF Diversity Wireless Cordless Lavalier/Lapel/Headset Microphone Mic System 400fts (4 Body Packs)

800 Selectable frequencies on each channel, up to 20 sets can be used simultaneously 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 ( Adjustable )