Walker's Razor X-TRM Digital Electronic Earmuffs - Razor Digital X-TRM Muff with cooling pads and moisture-wicking headband for extra comfort. Advanced Digital Circuit Active Dynamic Sound Suppression Hu-Gain Omnidirectional Microphones Dynamic Wind Noise Reduction Superior Clear Digital Sound Premium Cooling Headband Gel-Filled Ear Pads For Cooling And Comfort Audio Input Jack Recessed Volume Control Knobs Operates On 2 AAA Batteries Included