A good choice for anyone who needs a compact, back-up light without compromising on power. Put this light in your pocket and always be ready to light your way, wherever you go. Features Ten-Tap Programing, C4 LED, Pocket clip, and an anti-roll head. This light takes one AAA Alkaline battery (included), but for extended time lithium batteries are recommended. 70 lumens for 30 minutes (alkaline) and 2.25 hours (lithium). You can have 22 hours of steady light from this product at 5 lumens using 1 AAA lithium battery.