The Fenix LD10 is digitally regulated and digitally controlled. It has two output modes which produce a total of six levels of output. These modes not only allow the user to select the best compromise between brightness and runtime for any given task, but they also help to aid in an emergency. The LD10 does all this and still retains a very compact size. If you're looking for solid reliability, digitally-regulated brightness, and compact size, this Fenix is for you. Features * Cree 7090 XR-E LED * Two modes of output, selected by turning the bezel: General Mode: 9 lumens (34hrs) -> 47 lumens (6hrs) -> 94 lumens (2.2hrs) -> SOS Turbo Mode: 120 lumens (1.5hrs) -> Strobe * 17 days of survival use (2 continuous hours per day on the lowest setting) * Digitally regulated for constant brightness * Uses one 1.5V AA (Alkaline, NiMH, Lithium) battery (not included), inexpensive and widely available * 100mm (L) x 21.5mm (D) * Made of T6 aircraft-grade aluminum * Durable Type III hard-anodized finish * 50-gram (or 1.7 oz) weight (excluding batteries) * Water-proof to IPX8 standard * Toughened ultra clear glass lens with AR coating * Push-button tail cap switch * Capable of standing up securely on a flat surface to serve as a candle * Includes a holster, a lanyard, two spare o-rings, and a rubber switch boot This product comes with a textured reflector Operation Depress the tailcap button to turn the light on and turn the bezel to select the mode. A fully-tightened bezel will select Turbo Mode, and a loosened bezel will select General Mode. Soft-pressing the tailcap button while the light is on will change the output level of the selected mode. Turn the light off for over two seconds and the regulative circuit will be reset.