If you are looking for an intensely bright, high quality flashlight that uses inexpensive, widely available batteries and has a long run-time, then the Fenix L1S is your good choice!

The Fenix L1S employs a single AA battery to drive its Luxeon LED. The tail switch is not only easy to operate with one hand, but it's recessed into the tail frame so the flashlight can stand up on its end to be used as a candle. This compact, lightweight, and finely crafted flashlight comes with a lanyard as well as a belt holster so you can carry it in your pocket or on your belt without fear of losing it.

Uses a 1-watt R-binned Luxeon LED with a life of 100,000 hours
Current regulation
Two levels of output
High Output: 37 Lumens, 3 hours (Ni-MH)
Low Output: Constant 10 Lumens, 10 hours (Ni-MH)
Use one 1.5V AA ( Alkaline, Ni-MH, Lithium ) battery , inexpensive and widely available
Input voltage: 0.9V~1.7V
9.1cm (L) x 2cm (D)
Made of aircraft grade aluminum
Anodized finish
45-gram weight (excluding batteries)
Water-resistant (dunkable)
Toughened optic glass lens
Push-button tail cap switch
Capable of standing up securely on a flat surface to serve as a candle

Size compare with standard 91mm Victorinox Army Knife

Belt pouch