Walker's Razor Series Slim Shooter Folding Electronic Earmuffs - Two Omni Directional Microphones. Full Dynamic Range HD Speakers for clear balanced sound. Low Noise / Frequency tuned for natural sound clarity. Independent Volume Controls. Sound dampening composite housing. Sound Activated Compression - 0.02 second reaction time. Audio Input Jack. Recessed Volume Control Knobs. Comfortable headband withmetal wire frame. External Battery Door. Operates on 2 'AAA' batteries - Included. Two Omni Directional Microphones Full Dynamic Range HD Speakers for clear balanced sound Low Noise / Frequency tuned for natural sound clarity Independent Volume Controls Sound dampening composite housing Sound Activated Compression - 0.02 second reaction time Audio Input Jack Recessed Volume Control Knobs Comfortable headband withmetal wire frame External Battery Door Operates on 2 'AAA' batteries - Included