Nady UHF-4 Wireless Lapel / Lavalier Microphone System with True Diversity A full set of professional features. Unsurpassed state-of-the-art PLL UHF performance with operation up to 500 feet line-of sight Proprietary companding and low-noise circuitry for an amazing 120dB dynamic range DigiTRU Diversity for maximum range and dropout protection Half-rack receiver design with folding front panel dual antennas This is a single fixed-frequency wireless system. Please consult the manufacturer to confirm compatibility when attempting to use two or more of this system simultaneously or use it with other wireless systems.