This walkie talkie is powered by 3 AAA batteries (included) with a battery life of 12 hours. The BELOW ZERO 12kN Heavy Duty Carabiner with Locking Clip is a powerful and high-quality outdoor accessory. It consists of both privacy and priority channels. Voice Activated Transmit (VOX), allows for hands-free communication up to 3 miles. Push to talk or use Voice Activated Transmit for hands free communication. Vox Sensitivity adjusts to your environment for no false activations. Designed to integrate onto the Razor earmuff, this new attachment provides Walkie Talkie functionality by adding 22 Channels/ 99 Sub Channels with a 2-3 mile range.