Ultra lightweight and compact, the TLR-8 Weapon-Mounted Tactical Light with integrated aiming laser features the latest in C4 LED technology for high lumen operation. The light provides 1.5 hours of continuous runtime when in dual mode with the high power visible laser. It has 3 modes; laser only, LED only, and both laser and LED. If you double tap either switch, it will activate the strobe function. It includes one (1) CR123A lithium battery.