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). GTD-Audio G-787 wireless microphone system delivers superior sound quality and professional features. It is designed for a wide range professional application with 4x800 selectable frequency channels, automatic frequency scanning, true diversity operation, Tone Lock squelch circuit, automatic transmitter setup. It's the perfect for professional use at any events. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Microphones & Wireless Systems". The seller is "ohkie29" and is located in this country: US.