UHF wireless microphone series. 1,1 Master and 2 mic 2,transmitter distance: >80M ... 3,730~950MHz 4, Passed ISO, UHF wireless microphone series Frequency range730~950MHzShaking modeLocking and frequency within for timesFrequency stability ... 2PCS( 2*1.5V AA Size). We are manufacturer, professional microphones.1, 1 master, 2MIc.2, Transmitter distance: >80M3, 730~950MHz ...