The SureFire X300U-A Handgun Weaponlight is a popular choice among law enforcement and military personnel around the world. Using SureFire's own TIR lens, the X300U-A produces a powerful 1000 beam of blinding white light, generated through a recoil-proof LED emitter. The X300U-A is highly effective at close to medium range engagements with the beam's large center spot and peripheral illumination for constant situational awareness. This system is perfect for positively illuminating/identifying threats while simultaneously impairing your target's vision temporarily. In addition, the X300U-A has two modes, momentary-on and constant-on. Momentary-on is activated by pressing and holding down the ambidextrous tail-cap toggle switches, keeping the light activated until released. Constant-on is activated by quickly pressing and releasing the toggle switch, this will keep the light active until switched off.