Easy to activate with a quick twist, the bright, water-resistant LED is encased in a durable plastic housing, molded to a rugged plastic carabiner clip. Attach it to your key ring, belt loop, zipper pull, backpack or tankbag for efficient, bright illumination wherever you are, whenever you want. Perfect for everything from reading fine print to finding a keyhole. Attach to your clothing to let people know where you are in the dark for increased visibility and safety. Choose Red or White. Battery run time 24 hours on easily easily replaceable, included 3V Lithium battery. 0.18 oz. 1.7”×1”×.5”.