Nady DKW DUO HT B/D VHF Dual Wireless Handheld Microphone System &ndash; includes 2 microphones, AC adapter and audio cable &ndash; Easy setup &ndash; Karaoke, performance, presentation, public address Two wireless microphones and a receiver  Great dual system for karaoke, live performance, singing with friends. Operate either microphone individually or both simultaneously  Microphones provide up to 15 hours of wireless operation on a single 9V alkaline battery Each microphone operates on a single separate channel in the high-band VHF range for reliable, interference-free performance, and excellent high-fidelity audio. 150+ ft. typical operating range  up to 300+ ft. line-of-sight Easy, convenient operation with On/Off switch and low-battery LED indicator which flashes once for Unit On and lights steady for low-battery alert Features the Nady DM-20 unidirectional dynamic cartridge for optimum, clear sound quality, maximum feedback rejection and minimal handling noise Advanced audio processing circuitry for a wide dynamic range - no overloading for loud inputs or background hiss during quiet use. Special circuitry to eliminate transmitter on/off "pop" noise