This chopper headset is just like the H10-76 model, only upgraded with David Clark’s magnificent ENC (elecronic noise cancellation) technology. So in addition to the 24 dB noise reduction that comes standard, you can get an added 17-22 decibels when you turn on the ENC feature. This Low Impedance H10-76XL is equipped with an M-87 noise canceling microphone, coil cord and single U-174/U jack for your radio or intercom. FAIL-SAFE operation-you’ll keep communicating even if the power source goes down. The soft, double foam adjustable headpad and gel ear seals will help make your ride more enjoyable.