The Walker Razor Walkie Talkie Attachement features Voice Activated Transmit (VOX), which 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. Additional features include push to talk/voice activation, a 12 hour battery life, and it is powered by 2 (AAA) batteries that are included.