The Walker's Bluetooth Walkie Talkie for Razor Electronic Ear Muff is compatible with any Razor with a 3.5mm jack. Voice activated transmit allows hand's free communication.This Walkie Talkie attachment directly integrates onto all Razor Series Muffs. Enjoy hassle-free contact during shooting sessions with this muff walkie-talkie, offering a range of up to 3 miles for clear transmission with 22 channels and 99 sub-channels for your family and friends to join!