The Azden 500 XT system is desgined primarily for use in audio-for-video applications, with the receiver mounted on a camera and connected to the camera's audio input. The 500 XT system provides a choice of 63 user-selectable, crystal controlled, PLL-Synthesized UHF frequencies.
The 51 XT Plug-In Transmitter offers 63 user-changeable channels, so you'll always be able to zero in on a working frequency.