Wireless Lavalier Button Microphone With Magnetic Suction & Back Clip Design 1. The back clip design with magnetic accessories makes installation very flexible. The transmitter and receiver are very easy to carry, allowing the transmitter to be clipped on clothes very conveniently and quickly. 2. Double noise reduction: upgraded low-cut + ENC environmental noise reduction, precise reduction of noise of different frequencies, and retaining the original texture of human voice 3. The transmitter can be connected to the headphone monitor, and the sound recording can be more perfect while listening and recording 4. The mobile phone direct plug adopts the digital audio signal interface, which has strong anti-interference ability and more stable signal transmission Parameters: 1. Microphone directivity: omnidirectional 2. Frequency response range: 20Hz-20KHz 3. Wireless transmission: 2.4GHz adaptive frequency hopping 4. Microphone battery capacity: 70MAH (charging compartment 600MAH) 5. Charging time: about 50min 6. Battery life: about 6H 7. Signal-to-noise ratio: 64DBM adaptive noise reduction 8. Transmission delay: 30MS 9. Sensitivity: -42DB 10. Transmission distance: barrier-free 20 meters