This is a genuine David Clark Ground Support Headset H3335. I purchased it by mistake. It has never been used and has not been taken out of the box. These ground support headsets are designed to withstand background noise and distance attenuation. David Clark Genuine Ground Support Headset H3335 The H3335 headset is a ground support headset used for pushback and ramp operations. It is designed to withstand background noise and distance attenuation. • DC-1A noise-canceling dynamic microphone • Microphone on/off switch allows for hands-free communication • Ribbed head pad and foam ear seals for durability and comfort • Wire boom that can be placed on either the left or right side • 26-foot coil cord • PJ-051 (SC-267) plug • Corrosion-resistant chrome-plated headband/strap • Certified Noise Reduction Rating 24dB - Model: H3335 - Microphone Type: Dynamic Microphone - Headphone Type: Wired Headset - Included Accessories: Original box, instruction manual - Noise Rating: 24 dB • DC-1A noise-canceling amplified dynamic microphone • Microphone on/off switch on ear dome allows hands-free communication • Soft foam head pad with ribbed design and foam ear seals for exceptional durability and comfort • Hinged wire boom for easy microphone placement on right or left side • 26-foot coil cord with SC-267 plug mates with C31-XX extension cords • Corrosion-proof, chrome plated, headband/stirrup assembly • Certified Noise Reduction Rating (NRR)