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 w/metal wire frame - External Battery Door - Operates on 2 'AAA' batteries-Included