J20 One-two Wireless Lavalier Microphone Audio Video Recording ,Spec: 8 Pin Interface 1. One button three levels of noise reduction, easy to use2. 360 degree high fidelity sound pickup: 48K 16Bit lossless radio, using high sensitivity microphone, with digital processing technology, restore high fidelity sound quality3. Transmitter with charging box can work for 24 hours, long battery life4. Line-of-sight transmission up to 50 meters, stable radio, more stable creation5 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 live6. Small size, light weight, with a flat design with a clip as light as nothing, more aesthetic7. 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 timeParameters:1. Wireless transmission: Bluetooth protocol, 2.4GHz adaptive frequency modulation2. Working distance: 50 meters3. Built-in microphone: -38dB +-3db omnidirectional condenser microphone4. Frequency response range: 20Hz-20KHz5. Headphone monitoring: adaptable to TYPE-C interface headphones6. Support reverb function, support three-stage noise reduction7. Using time: TX-8 hours, RX-8 hours, 24 hours with the charging case8. Charging time: TX-1.5 hours, RX-1.5 hours, charging box: 1.5 hours