Surefire XT00, Tailcap Switch Assembly, Fits X-Series Weaponlights (Not Compatible with XH50G), Pressure Pad Not Included, Black XT00 The XT00 switch provides reliable" remote activation for SureFire X-Series WeaponLights (except the XH50G) attached to any MIL-1913 Picatinny rail. The XT00 features a constant-on/off toggle switch and a lockout toggle switch to prevent accidental operation. The XT00 accepts ST07" SR07" SR07-D-IT" and their longer cable models.