ITEM NAME:Head Headset Mic Headworn Microphone Wireless Mic System for Teaching Speech Description: A high performance wireless microphone for voice amplifier. More natural and clear voice, just as the original voice. Widely apply for teaching, tour guide, sales, speech, conference, meeting, etc. Fast wireless transmission, automatic pair, up to 50m wireless transmitting distance. 3.5mm to 6.35mm converter as free accessory, suitable for professional stage & studio audio equipment. More compatible, excellent stabilized signal, strong anti-jamming capacity. Specification: Sensitivity: 39dBÂ ±1dB Audio response: 720-820MHZ Frequency response: 20HZ-23kHZ Charging voltage: DC5V 300mAh Distortion: