Comfort: The Razor series feature Walkers new comfort fit headband for all day shooting Audio Input: The electronic muff features a 3.5mm audio input jack for use with iPods, MP3 players and handheld radios Volume Control: The Walkers Razor Slim Electronic Muffs feature an on/off and volume knob with raised ridges so you can adjust even while wearing gloves Bundle Includes: Walker's Razor Slim Electronic Muff (Light Teal), Walker's Razor Tactical/Hunting Walkie Talkie Attachment, Walker's Crosshair Sport Shooting Glasses (Clear) and Microfiber Cleaning Cloth Low Profile: These 'Razor' thin muffs were engineered from the ground up with the goal of having the lowest possible profile without compromising the hearing protection and amplification properties of the muff