A state-of-the-art headset offering many desirable features, including Active Noise Canceling circuitry & an acoustically balanced 4-speaker sound system for superior performance. Other features: rubberized ear cups with silicone gel ear seals and soft wool head pad for comfort, a noise-canceling electrets mic, dual volume controls, and a mono/stereo switch incorporated into the 65″long cable. Includes an auto-shutoff 9V battery case. (Optional panel mount dc power converter available) 18-20db ANR @ 200 Hz. 3 yr warranty by Headsets Inc. Comes with carrying case.