Motorola DTR series radios cover up to 350,000 sq. ft. with up to 19.5 hours of life per charge and 25 public/group channels. Digital radios do not work on VHF or UHF, but the crystal clear digital audio does not have any static. These radios offer both private and public channels as well as meeting military standards for ware, dust, shock and fall resistance. Radios can be custom programmed by customers with free software, but the programming cable must be purchased.