Bluetooth sync with mobile devices. This set contains 2 × Walker's Razor Slim Quad Electronic Earmuffs with Ultra Low Profile Ear Cups (Flat Dark Earth), 4 x Aaa Batteries, Limited 1-Year Warranty, 2 × Walker's Razor Tactical and Hunting Walkie Talkie Attachment, 2 × Walker's Crosshair Sport Shooting Glasses (Clear), and 2 × Top Brand High Quality Microfiber Cleaning Cloth.