Motorola MTRRDU4100 High-powered radio offers ten channels on 89 UHF frequencies with 122 privacy codes. Robust four-watt power provides coverage up to 350,000 square feet or 30 floors. Meets military standards for high resistance to shock, dust, moisture and vibration. Offers voice-activated operation with optional audio accessories. Sound output of 2000 mW output ensures a quality reception even in noisy environments. Power Source(s): Lithium-Ion Battery; Number of Channels: 10; Color(s): Black.