Set to factory default UHF frequencies (good for both inside and outside use). 2-Watt (covers up to 20 floors, 250,000 square feet range), 4 channels (communication groups) total - only 2 channels activated out of the box though. RMU2040 is direct replacement to RDU2020 Each of our radios comes complete with a single-unit charger, 15 hour Lithium ion battery, swivel belt holster, 1-year warranty 6 Pack of radios and Associated Accessories One of our most popular models. Very good, simple, heavy-duty radio for many different industries The RMU2040 on-site two-way business radio helps you communicate instantly, without missing a beat. With crisp, clear audio throughout the workplace and exceptional durability. 2 watt radio operates on 99 UHF business exclusive frequencies and is FCC Narrowband ready. Enhanced audio quality, a rugged design, and versatile HTML-based customer programming software make this radio an exceptional choice for all of your on-site business needs.