Ultra Low Profile Ear Cups- Rubberized Coating- Four Hi Gain Omni Directional Microphones- Audio Input Jack- Low Noise / Frequency tuned for natural sound clarity- Volume Control- Compact Folding Design- Comfort headband w/ metal wire frame- Sound dampening composite housing- NRR 23- Sound Activated Compression – 0.02 second reaction time- Recessed Volume Control Knob- External Battery Door- Operates on 2 In.AAAIn. batteries included