NovaTac 120E Every Day Carry LED Flashlight 3 Pre-set brightness levels for maximum versatility (10, 42 or 120 Max Lumens) Signal strobe can be used as an emergency beacon Extended Tactical button makes it easy to turn on/off even while wearing gloves Powered by (1) CR123 battery (included) Runtimes: 120 lumens/30 min., 42 lumens/2.5 hrs., 10 lumens /14hrs. Measures 3.3 inches long by 1 inch wide and weighs a mere 3.1 oz.