The TK35 U2 LED Flashlight from Fenix is a powerful compact flashlight that offers output in four stages from 15 to 860 lumens, as well as two flashing modes. A convenient dual switch in the tail cap operates the light. Runtimes vary from 1.5 hours at full power to 130 hours at 15 lumens. This extremely bright light has a glass lens with an anti-reflective coating, and the body of the flashlight is made from aircraft-grade aluminum in a premium type III hard anodized anti-abrasive finish. It's waterproof to 6.5' (IXP-8 standard).
The output is digitally regulated to maintain constant brightness, and there's reverse polarity protection to protect against improper battery installation. A low-voltage warning function reminds you when power is low. The TK35 operates on 4x CR-123A or 2x 18650 batteries. The LED lamp has an approximate life of 50,000 hours. All of this in a flashlight 6.5" long that weighs only 9.7 oz! Batteries not included.