PYLE-PRO PDWM5000 - 4 Mic VHF Wireless Microphone System Features: - Professional VHF Wireless System - Quartz Lock for Drift-Free Operation - Four Microphones Included Power On/Standby/Off Switch - Audio Mute Circuitry For Quiet Operation - Advanced Companding Circuitry Individual Channel Volume Controls - Individual 1/4'' Unbalanced Outputs - 1/4'' Unbalanced Mixed Output Operation Range: Up To 240 ft. - Battery Life: Approx. 12 Hours - Batteries and 1/4'' Audio Cables Included Power: 110V/220V Selectable - Rack Hardware Included - Dimensions: 2.04"H x 19.09"W x 9.44"D -inches