The Surefire SR Remote Dual Switch provides remote activation for any SureFire WeaponLight with a switch socket. Two switches-a momentary-on pressure pad switch and a constant-on pushbutton switch-are integrated with a snap-on clamp for easy attachment to your firearm's Picatinny rail forend. When choosing an SR switch model, the two digits after the "SR" indicate the cable length in inches. For example the SR07 has a 7-inch cable. The seven-inch cable length works with most rifle/carbine applications. Fits: Millennium Universal, Classic Universal, Scout Light with socketed tailcap, and X200, X300, and X400 with XT tailcap FeaturesProvides remote momentary-on and constant-on WeaponLight activation Switch platform clips to Picatinny rail without tools Weatherproof switches and plug