Pro Tac HL is our brightest compact handheld yet! 600 Lumens on High for 1.5 hours of run time. 35 Lumens on Low for 18 hours of light. Multi-function, push-button tail switch for one-handed operation. Durable anodized machined aircraft aluminum construction. Uses two 3V CR123A lithium batteries (included). Limited lifetime warranty Ten-Tap Programming C4 LED technology, impervious to shock with a 50,000 hour lifetime 3 light output levels Multi-function, push-button tail switch for one-handed operation Optimized electronics provide regulated intensity