Note: There are two versions of this headset PTT. (Military version and civilian version). When placing an order, please select the correct version to place the order, if you are not sure or do not know, please contact our customer service. The bracket rail adapter is an ARC OPS center helmet rail for FAST series helmets, ACH series helmets and MICH helmets. This bow helmet rail adapter can rotate 360° and move up and down. The clip on the headphone stand can also be rotated. The length of the stand can also be adjusted. High-strength material: The plug wire is made of transparent wire and TEP cap, which is flexible, high-strength, anti-freeze, not easy to age, and hard. The headband of the earphone is made of first-layer cowhide, which is not easy to deform. Silicone earmuffs: The earmuffs are made of silicone instead of ordinary sponge. So the earmuffs are more elastic and firm, and the ears are more comfortable. Chip protection: The headphone chip has good film protection, higher defense ability, mildew-proof, dust-proof and moisture-proof. Headphone plug: military standard 7.0mm plug. The plug cable is made of kraft paper cable and TEP cover. With flexibility, strength and frost resistance, it is not easy to age and harden. These headphones feature electronic active noise cancellation and sound capture technology to provide your ears with clearer, more natural sound and protection. Note: Helmet and battery not included.