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