Features:1.The new version accessories can be connected to special headphones for a full range of FAST helmets, MICH helmets and peltor comtac walkie-talkie.2.Through testing,headphones for Comtac I,Comtac II can be connected to the full range of FAST helmet by hanging buckle.3.After using the buckle, earmuffs for comtac walkie-talkie headphones will be separated from the curved headband, directly clip to the buckle, and the buckle can be fixed in the groove on the both sides of the helmet ,after installation, earmuffs for comtac headphones are free to rotate.Usage: 1.Take off the earmuffs from bracket on the both sides 2.Take out the wire on the earphone from cover (must break hoop package) 3.Clip the earmuffs on the hanging buckle of the product (align the location, and clip it at both left and right ) 4.Install it on the helmet 5.swirl the wiring of the earphone on the top of the helmet, and fix it with adhesive tape