BOYA BY-WM6 Ultra High Frequency UHF Wireless Lavalier Microphone System for Canon Nikon Sony DSLR Camera Audio Recorder Ideal for ENG/EFP, DSLR Video;Compander for High-quality and Clear sound 48 UHF Channels;Mic and Line-in;Easy to use, with display Selectable Mute function;Camera-Mountable Receiver;Monitoring sound by headphone output (Receiver) Includes Omni-Directional Lavalier Mic;Includes XLR output cable, Stereo mini plug cable;More than 6 Hours Continuous operation Operation range can reach up to 100m(300')(without obstacle);Power Supply: Two (2) AA batteries