4" overall. High performance composition construction. White LED. Clamps securely allowing hands free usage. Compact size allows it to fit almost anywhere. Clamps to caps, backpacks, laptops, clipboards, tool boxes, brackets, sun visors and much more. Fit in pockets, glove compartments, and tackle boxes. Uses three LR44/AG13 batteries (included). Battery Life up to 55 hours. (Comes in four assorted colors. Sorry, color strictly our choice). Hang carded. Clamplight products have a clamp integrated into their body allowing for versatility and portability. Transforms from a regular flashlight, to a clamp light, to a stand light providing light where you need it and freeing up two hands to work. The head pivots for added convenience. Unlimited uses including automotive, household, camping, outdoors, and much more.