The ST switch lets you remotely activate any SureFire WeaponLight that has a switch socket. The switch pad has adhesive-backed Velcro for attachment to desired location. Plug is O-ring sealed, weatherproof. Cable length is measured from opening of plug skirt to beginning of tape switch. 7 inches cable length (ST07) fits most rifle/carbine applications. Features: Provides remote momentary-on WeaponLight activation Tape switch attaches with adhesive-backed Velcro Unit is O-ring sealed, weatherproof SureFire WeaponLights with plug sockets, including millennium universal, classic universal, scout light fitted with socketed tail cap, X300, X400 with XT tail cap assembly