J20 One-two Wireless Lavalier Microphone Audio Video Recording ,Spec: 8 Pin Interface 1. One button three levels of noise reduction, easy to use 2. 360 degree high fidelity sound pickup: 48K 16Bit lossless radio, using high sensitivity microphone, with digital processing technology, restore high fidelity sound quality 3. Transmitter with charging box can work for 24 hours, long battery life 4. Line-of-sight transmission up to 50 meters, stable radio, more stable creation 5 Dual-channel radio system: by a receiver and two transmitters, can simultaneously capture two sources of sound, the perfect solution for two people VLOG and two people live 6. Small size, light weight, with a flat design with a clip as light as nothing, more aesthetic 7. Furry wind shield can effectively suppress wind noise, in windy or noisy environment can still be included in the clear sound. 8. Plug and play, support cell phone charging at the same time Parameters: 1. Wireless transmission: Bluetooth protocol, 2.4GHz adaptive frequency modulation 2. Working distance: 50 meters 3. Built-in microphone: -38dB +-3db omnidirectional condenser microphone 4. Frequency response range: 20Hz-20KHz 5. Headphone monitoring: adaptable to TYPE-C interface headphones 6. Support reverb function, support three-stage noise reduction 7. Using time: TX-8 hours, RX-8 hours, 24 hours with the charging case 8. Charging time: TX-1.5 hours, RX-1.5 hours, charging box: 1.5 hours