Headset shoppers in search of the ultimate combination of hearing protection, crystal clear communications, and unsurpassed comfort have found it in David Clark's H10-13X ANR Headset. A single 9V battery enhances the headset's passive Noise Reduction Rating (NRR) of 23 dB by an addition 17-22 dB of low-frequency electronic noise attenuation. The battery delivers up to 25 hours of reliable ANR noise suppression, and the unit boasts a user-selectable Auto Shut-off feature to prevent against inadvertent battery usage.With comfort a top priority, David Clark designed the H10-13X with a super soft foam-filled pillow headpad and its trademark undercut gel ear seals for unequaled all-day comfort. The unit's M-7A electret noise-canceling mic delivers crisp, clear transmissions without background noise, and the stereo phones are ideal for in-flight audio entertainment. At just 18 oz. (without cord assembly), this is a remarkable aviation headset that'll serve you well for years of reliable cockpit comfort.