Features: 2.4G Wireless Microphone System: adopts 2.4G frequency band, features stable signal transmission and 50m effective range, not easy to be interfered, for ideal for film & vlog recording, live streaming, interview, etc. Paired Transmitter & Receiver: transmitters and receiver have been paired, just turn them on, then the transmitter and receiver will automatically link to the frequency within 3s, plug and for play, without tedious debugging. Dual Microphones Design: built-in microphone and supports omnidirectional pickup with clearer sound, also comes with an external lapel microphone, which allows users to record more flexibly. Built-in Rechargeable Battery: both transmitter and receiver have built-in rechargeable battery that can be charged via the provided USB cables, and working for time is up to 8H after fully charging. Real for Time Monitoring: the receiver has real-time return monitoring interface, you can connect headphones to monitor the recording effect; backside clip design, can be fixed on collar easily and quickly. Package Includes: 1x Wireless Lavalier Mic 1x Transmitter 1x Receiver 2x Type-c Charging Cables 1x 3.5mmTRSCable(forcameras or computer) 1x Type-ctoType-c Cable 1x 3.5mmTRRSCable(forsmartphonesandtablets) Specifications: Material: ABS Model: V81 Built in DSP: YES Noise Cancellation: YES Signal Transmission: 2.4GHz Frequency Response: 2.4 - 2.4835 KHZ Compatibility: for Hero Action Cameras, PC, DSLR, Camcorder etc. Mute: Yes Charging time: About 2 Hours Operating Distance:30M Output Method:3.5mm Output & Type-C Output Working Time:8-10H Volume Control Knob;Yes note: 1. Connect the rx receiver to the mobile device with the phone cable, connect the camera video/audio/sound card/mixer and other devices with 3.5mm audio jack with the camera cable. 2. Press the rx receiver switch for key and turn on the power switch. 3. When the rx receiver indicator light is green, the receiver is in standby mode, and the connection between the rx receiver and the tx transmitter is normal.