Rockville RWM4200VH VHF (4) Wireless HandHeld Microphones 4 Church Sound Systems Features of RWM4200VH: Rockville RWM4200VH VHF Wireless (4) HandHeld Microphone SystemRack Mount Ears IncludedDigital display on receiver and on each microphoneHigh performance wireless hand held microphone systemIncludes RWM4200VH transmitter with (4) hand held, high sensitivity, unidirectional, wireless cardioid microphonesProfessional rack mount designFeaturing a dual filter design to limit feedback and interferenceIndividual microphone volume controlComfortable ergonomic composite microphone constructionLow power consumption for longer battery lifeUltra signal stability minimizes audio artifactsOperating Range: 100'-200'(indoor), 65'-165'(outdoor)Channel: Four ChannelFrequency Range: 175MHz-216MHzFrequency Stability: ±0.005%Modulation Mode: VHFFrequency Response: 50Hz-15KHz(±3 dB)Dynamic Range: 110dBS/N: 90dBT.H.D: < 0.1%(1KHz)Audio Output Jack: XLR balance & 1/4" MixedPower Voltage: AC110V-240V 50/60HzOperating Temperature: 14°F-122°FMic Battery Operating Time: up to 8 hours Frequency groups: Group A-- 215.20 MHz, 203.40 MHz, 185.15 MHz, 174.10 MHzGroup B-- 212.10 MHz, 202.10 MHz, 183.60 MHz, 174.80 MHz