Features: 1. New accessories can be connected to specialized headphones for a full range of FAST helmets, MICH helmets, and Peltor Comtac walkie-talkies. 2. Through testing, headphones for Comtac I and Comtac II can be connected to the full range of FAST helmets using the hanging buckle. 3. After using the buckle, the earcups for Comtac walkie-talkie headphones will be separated from the curved headband, directly attached to the buckle, and the buckle can be fixed in the groove on both sides of the helmet. After installation, the earcups for Comtac headphones are free to rotate. Usage: 1. Remove the earcups from the bracket on both sides. 2. Take out the headphone cable from the cover; the hoop package must be broken. 3. Attach the earcups to the hanging buckle of the product, adjust the position, and secure them on both the left and right sides. 4. Install it on the helmet. 5. Wrap the headphone cable around the top of the helmet and secure it with tape. Packing List: 1 Pair x Headphone Holders