(2) Hi-Gain omni-directional microphones. 23dB noise reduction rating. Full, dynamic range HD speakers. Low noise/frequency tuned for natural sound clarity. Independent volume controls. Sound dampening composite housing that looks like carbon fiber. Sound activated compression. Audio input jack. Recessed volume control knobs. Comfortable head band with metal frame. External battery door. Requires (2) AAA batteries (included). Clam packed.