David Clark's remarkably well-constructed H10-13S Stereo Headset proves that the best can indeed get even better. With the -13S, the legendary David Clark Company brings users a stereo version of its world-renowned H10-13.4 model. This version of the venerable passive headset still features the ultra-comfortable, gel-filled ear seals and incredibly soft, double-foam head pad of its monaural counterpart; as well as the same M-7A amplified electret microphone and 23 dB Noise Reduction Rating (NRR) for an unparalleled level of comfort and noise attenuation.What sets the -13S apart is its dual volume controls and stereo audio capability for a perfectly customizable, "just right" level of amazing audio. Weighs a mere 1/2 oz. more than the H10-13.4 (17 oz. vs. 16.5 oz.) and costs just a hair more for spectacular stereo sound. A state-of-the-art aviation headset that further raises the bar in audio excellence.