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! - 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