The David Clark H10-13 S is a stereo version of the H10-13.4. It features super soft, double foam head pads and comfort gel, undercut ear seals. The certified noise reduction rating is 23 dB. David Clark headsets feature a universal flex boom with the M-7A microphone, the most advanced noise-canceling microphone available. All David Clark headsets come with a 5 year warranty and comply with FAA TSOs C57 Cat. B and C58a pertaining to headsets and microphones. David Clark headsets exceed RTCA/DO-214 standards. Weight: 16.5 oz.