Nady Dkw-1 Lavalier Wireless System (Ch D) Features - High-band VHF (170-216 MHz) operation for interference-free performance Advanced companding circuitry for a wide dynamic range (no overloading for loud inputs or background hiss during quiet use) Full frequency response from 40-20,000 Hz 250 ft. typical operating range, up to 500+ ft. line-of-sight