Selling my David Clark H10-40 headset: Well maintained and fully functional.

David Clark Model H10-40 noise attenuating aviation headset

• M4 electret microphone

• Noise Reduction Rating (NRR): 24 decibels.

• Cord: 5-foot straight cord with

• M642/5-1 & M642/4-1 plugs.

• Certification: FAA TSO C57-CAT.B