The ProTac may be small in size but it's big on function and performance. In a pocket-sized package about the size of a marker, this light features a 130 lumen output on high as well as a 10 lumen low output for optimal lighting whatever your situation. The multi-function push button tail switch is ideal for one-handed operation. Durable and abrasion-resistant machined aluminum construction will hold up to the rigors of an everyday carry and a removable pocket clip makes for easy access. The ingenious anti-roll head keeps the brilliant gizmo from rolling away when you set it down. Features and Specifications: Output: High: 130 lumens/ 1.75 hour runtime Low: 20 lumens/ 13 hour runtime Strobe: 3.5 Hours runtime Uses two AAA alkaline batteries (Batteries included) Length: 5.62" (14.27 cm) Weight: 2 oz. (57g) with batteries C4 LED technology, impervious to shock with a 50,000 hour lifetime LED Solid State power regulation provides maximum light output throughout battery life Multi-function, push-button tail switch for one-handed operation Optimized electronics provides regulated intensity Durable and abrasion-resistant machined aluminum construction with Type II Mil-Spec anodized finish Anti-roll head prevents the light from rolling away when you set it down Removable pocket clip for easy access O-ring sealed glass lens IPX7; waterproof to 1 meter for 30 minutes Manufacturer's limited lifetime warranty