Product ModelYM-2Frequency Range 902.0 - 914.4 MHzFCC ID2AUN3-YY-801Working RangeUp to 300 ftS/N>98dBMax Deviation Range±50kHz (with level limiting) RF Carrier Stability± 0.005 %(-10C-50C)Transmitter Frequency Power30mw Transmitter Power ConsumptionUp to 6 HrsReceiver Power ConsumptionUp to 6 Hrs Wireless Microphone System with 3-type microphones for Multi-scenario application Some Questions and Answers for problems occured during using. Wireless Microphone System Device Parameters