BOYA BY-WM6 UHF Wireless Omni-directional Lavalier Microphone with 48 Channels More than 6 Hours Continuous Operation for ENG EFP DV DSLR Video Camera Compander for High-quality and clear sound, Easy to use, with display. 48 UHF Channels, Operation range can reach up to 100m without obstacle. Powered by 2 AA Batteries(Not Included), More than 6 Hours Continuous Operation. Selectable Mute Function. Camera-Mountable Receiver. Monitoring sound by headphone output(Receiver). Includes Omni-Directional Lavalier Mic, XLR output cable, Stereo mini plug cable.