The rail adapter of the bracket of this headset is the ARC OPS core helmet track, The rail adapter can be used for the full range of FAST helmets, ACH helmets, MICH helmets and other helmets with ARC rails on the sides. This ARC helmet rail adapter can rotate 360 and move up and down. The card slot on the headphone holder can also be rotated. The length of the stand can also be adjusted. Helmet type: Unlike traditional airsoft headsets, helmet headsets can be directly mounted on the helmet.You can freely install accessories, such as lights, cameras, etc., on the top of the helmet rail during use. When not in use, it can also be rotated to the side or back of the helmet to simplify storage. Sponge earmuffs-comfortable sponge, high-quality sponge, will not squeeze the ears for a long time, but also have a good noise reduction effect. Chip protection: The COMTAC II earphone chip is well protected by a layer of film, which has higher defense, mildew, dust and moisture resistance. Electronic noise reduction-through electronic active noise reduction and sound pickup technology, these headphones can provide clearer and natural sound and protect your ears. 2-pin microphone, a new type of microphone in the Comtac series of noise-canceling headphones, made of high-quality plastic, durable. The soft sponge effectively protects the microphone from damage and scratches. KENWOOD U94 PTT is suitable for all series of tactical headsets, with simple operation and small size. The sturdy back clip provides a secure connection through the metal clip on the back for vest/shoulder straps. Easy to install and operate. Suitable for military standard plugs and push-to-talk buttons. Note: not including helmet