BOYA BY-WM5 2.4GHz Wireless Lavalier Microphone System for Canon Nikon Sony DSLR Camera Camcorder Audio Recorder Boya WM5 lavalier microphone consists of a transmitter, receiver, two piece of earphone( one is with speaker), an audio signal cable, a lavalier/lapel microphone The 2.4GHZ GFSK system result in strong anti-interference, good security and stability.Experience more freedom of movement while recording;Excellent sound quality,great portability,easy setup Two way communication system,but only sound from transmitter can be recorded The operation range is 60m without obstacle, 360 degree all-round revolveis workable, the maximum distance can reach up to 80m.Approximate 50m(164ft.) operation range The receiver with standard hotshoe, compatible with DSLR cameras, camcorders, audio recorder etc.You can adjust the volume through VOL+ and VOL- volume control.The lapel clip makes it easy to carry