Nady DKW-3 LT/O/D VHF Single Receiver Lavaliere Microphone System VHF Single Receiver Lavaliere Microphone System VHF (170-216 MHz) operations for reliable, interference-free performance 150+ ft. typical operating range  up to 300+ ft. line-of-sight Advanced audio processing circuitry for a wide dynamic range  no overloading for loud inputs or background hiss during quiet use 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.