BOYA BY-WM24G Wireless Lavalier Microphone System for Canon 6D 600D 5D2 5D3 Nikon D800 Sony A9 A6 Panasonic Camcorders Includes Transmitter with Belt Clip, Receiver with Camera Shoe/Tripod Mount, Lavalier & 2 Earphones 2.4GHz Wireless system features internal boost antennas with a 164-foot (50-meter) range Receiver headphone features second isolated microphone to communicate with the transmitter headphone (audio does not pass through to output) Audio input/output: 3.5mm Transmitter and receiver are each powered by two AAA batteries (not included) which provide 3.5-4 hours of runtime