The worlds smallest brightest one-ounce machined aluminum one LED flashlight! The Key-Mate runs longer and stays brighter. Reflector optics deliver up to 400% more lighting range than traditional penlights Easily attaches/detaches to just about anything with convenient pocket clip or key ring Up to 96 hrs. run time Includes neck lanyard O-ring sealed for water-resistance Powered by 4 alkaline button cells (included) 100000 hr. lifetime high-intensity LED with reflfl ector optics LED available in white (10 lumens) blue (.7 lumens) or green (2.6 lumens). 2.36 in. 0.9 oz. Available in black or titanium with white green or blue LEDs and Realtree Camo with green LED.