Voice Activated Transmit (VOX), allows for hands-free communication up to 3 miles. Walkie Talkie Attachment has 22 channels and 99 sub channels for your family and friends to join! Features: Custom designed to integrate onto the Walkers Razor muffs (Muffs sold separately, will not work with Razor Quads) 22 Channels 2-3 Mile range Push to Talk / Voice Activated Powered by 2 (AAA) batteries included Battery Life: 12 hours