UST BrightForce Pico LED Flashlight BRIGHTNESS: 20 lumens of bright, clean light DIMENSIONS: 1.5 H x 0.5 W and weighs 0.4 oz with (4) LR41 batteries (included) EASE OF USE: Rugged knurling on bezel for easy ON/OFF operation and a carabiner clip for quick attachment to tents, packs or car keys RELIABLE: 15 continous hours of runtime with an unbreakable LED bulb that never needs to be replaced DURABLE: IPX4 Water resistant, anodized aircraft grade aluminum construction with a silicone o-ring seal