The model FLEX IV DSP D is the most advanced conventional and LTR controller that combines the functions of a CTCSS Controller, DCS Controller, LTR Controller, and LTR Validator in a 1U size chassis. Internal hardware allows the unit to share a channel with both LTR and conventional users. Cross busy input can be used for additional flexibility.

Advanced Windows based program allows all parameters and audio levels to be programmed remotely using any IP Network.

A display function allows the user to remotely monitor the site showing realtime status information. Every single transaction on the controller is recorded for analysis and billing purposes.