E Gear Pico Lite Black. 1 3/8" overall. Aerospace aluminum body with
carabiner clip which easily attaches to keyring or zipper pack. Super
bright LED with 10 lumen output, visible up to 30 ft. Water Resistant.
Uses four LR41 Batteries (included). Up to 15 hour burn time per battery
set. Weighs only 0.2 oz.