Features: 2.4G wireless transmission, up to 70m long transmission distance, safe, reliable and low latency. Built-in DSP active noise cancellation technology, the background noise is reduced by 50%. According to the noise frequency characteristics in different scenes, two gears of manual enhanced noise reduction are provided(75Hz/150Hz). Two transmitters can be divided into dual-channel, mono-channel or combined into mono-channel, to obtain maximum flexibility inpost-production. The receiver is designed with TFT display screen, it dynamically displays the working status in real time. Clip-on design, the back clip of the device can be used as a microphone lavalier, and it also can be adapted to the hot shoe slot of the camera. Small size and lightweight, easy to carry and use. Compatible with SLR, camera, mobile phone and computer. Suitable for live broadcasting, video conference, interviewing, speech, etc. Specification: Color: Black Material: ABS Transmission distance: Up to 70m Battery capacity: 250mAh RF frequency: 2.4GHz Transmitting power: 14dB o gain: 0-4 level Signal-to-noise ratio: 20Hz-14.5KHz Noise reduction grade: 0-75Hz-150Hz Microphone: Capacitive Omnidirectional Receving sensitivity: -95dB Maximum output level: 1.7Vp-p Output impedance: About 47Ω Charging power: 5V/200mA Item size: 4.7 * 4.67 * 1.9cm /1.85 * 1.84 * 0.75in Packing list: 2 * Transmitter 1 * Receiver 2 * Transmitter windproof cover 2 * 3.5mm o cable 1 * Charging cable 2 * Microphone 1 * User manual