Features: Easy to carry and use, the body is small that you can carry anywhere, the receiver and transmitter will automatically connect after pressing the switches for 2 seconds. Adopt 2.4G ISM global unlimited frequency band transmission, its signal transmission is stable and the effective use distance reaches 50 meters in open and wide area. Built-in electret microphone and supports omnidirectional pickup with clearer sound, also supports external lavalier microphone, which allows users to record more flexibly. The transmitter and receiver both have built-in rechargeable battery that can be charged via the provided USB cables, and working time is up to 7 hours after fully charging. With 3.5mm TRRS/ TRS cable, widely compatible with devices with 3.5mm interfaces like computers, digital/ SLR cameras, camcorders, voice recorders, tablets and mobile phones.