headset microphone,UHF microphone

U9 UHF Wireless Teacher Headset Microphone and Receiver Set for Amplifier or Speakers UHF wireless Mic headset microphone,UHF microphone Item No.: U9 UHF wireless microphone connects any speaker or amplifier to be wireless device. SD-U9 (UHF wireless microphone&Receiver) Headset wireless microphone: Transmit Power output:13dBm 2. Sensitivity:-61dB(+-1dB)(0dB=1V/Pa) 3. Direction features:Unidirectional 4. Polymer battery: 3.7V 550mA 5. Impedance:≤2.2KΩ 6. Product size: 150*190