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. NOTE: Length of cable in inches is indicated by the two digits following "ST" in model number. Cable length is measured from opening of plug skirt to beginning of tape switch. Seven-inch cable length (ST07) fits most rifle/carbine applications.