For Professional videographers on a limited budget and video hobbyists. The WR-PRO 2-channel switchable VHF receiver, allows you to switch to the other channel if one is being used, or is noisy. The range is more than 200 feet. All receivers and transmitters in the "PRO" Series are on the same 2 frequencies (169.445MHz and 170.245MHz) and use the same circuitry, making them interchangeable, and allowing you to add to your system at any time.