Features: Rockville RWM3300UA 200 Channel UHF Wireless Dual HandHeld Microphone Mic System High performance wireless hand held microphone system Includes RWM3300UA transmitter with (2) hand held, high sensitivity, unidirectional, wireless cardioid microphones Professional rack mount design with LCD displays Featuring a dual filter design to limit feedback and interference Individual microphone volume control Comfortable ergonomic composite microphone construction Low power consumption for longer battery life Ultra signal stability minimizes audio artifacts OSA technology: Locates, prioritizes, and selects the clearest frequency for the best sound quality The display on the mic and the receiver show the battery life Operating Range*: 200´-260´(indoor), 160´-220´(outdoor) Channel: 200 Channel selection Frequency Range: 500MHz-599MHz Frequency Stability: ±0.005% Modulation Mode: UHF Frequency Response: 40Hz-15KHz(±3 dB) Dynamic Range: 110dB S/N: 90dB T.H.D: < 0.1%(1KHz) Audio Output Jack: (Ch1/Ch2) XLR balanced + 1/4" mixed Power Voltage: AC110V-240V 50/60Hz Operating Temperature: 14°F-122°F Mic Battery Operating Time: up to 8 hours