The DTR 620™ digital on-site portable radio offers all the great features of the DTR550, plus management capabilities. The radio features operate at 900 MHz and offer enhanced communication options, such as one-to-many digital calls (public group call and private group call). It also offers improved performance with greater coverage – up to 350,000 square feet or 30 floors (with a long whip antenna) – as well as longer battery life and clear, crisp digital audio quality in coverage areas.