High-powered radio offers 89 UHF frequencies ideal for indoor usage and 122 privacy codes to block interference. Robust four-watt power provides exceptional coverage of 350,000 square feet or 30 floors. Meets military standards for high resistance to shock, dust, moisture and vibration. Free downloadable programming software allows users to program additional features and enable for quick cloning between new and multiple devices. Offers advanced VOX voice-activated operation with optional accessories, so you can leave your hands free for other tasks. Sound output of 2000 mW output with wind and noise reduction ensures a quality transmission even in noisy environments. A tri-color LED indicates your unit and call status at a glance. Power Source(s): Lithium-Ion Battery; Number of Channels: 10; Color(s): Black; Power: 4.0 W.