BOYA Wireless Microphone BY-WM5 for DSLR Camera Camcorder Audio Recorder LF479 The 2.4GHZ GFSK system result in strong anti-interference, good security and stability. Two-way communication, but only sound from transmitter can be recorded. The operation range is 60m without obstacle, 360 degree all-round revolve workable, the maximum distance can reach up to 80m. You can adjust the volume through VOL+ and VOL- volume control. The lapel clip makes it easy to carry.