Machined aircraft aluminum construction is virtually unbreakable. The 100,000-hour white LED runs up to 96 hours on four high-capacity button-cell batteries (included). O-ring sealed light is up to 400% brighter than penlights. Rotary head switch makes accidental activation unlikely. Compact-2.36"L, 0.9 oz. with batteries. Snap hook with swivel, spring steel pocket clip and breakaway lanyard included. Color is Black with Blue LED.