The Lectrosonics 100 Series Wireless UHF Lavalier Mic Set (Freq Block 25) includes a camera-mountable receiver and a belt-wearable transmitter with a Tram TR50 omnidirectional lavalier microphone that can be pinned to a shirt collar. There are 256 selectable frequencies over a 25.6MHz band so that you can avoid interference from local RF sources. To see what channels and frequency ranges are available to you under block 25, please see this chart. Frequency selection is achieved via recessed rotary switches located on the side panel. An easy-access audio output adjustment knob is located on the front panel. The input section features a tap suitable for any microphone or line level audio source. A level dial conveniently adjusts impedance gain levels to accurately match different microphones and line sources. This lavalier mic transmitter/receiver set is ideal for interviews, news stories, and events.