NovaTac 120P Programmable LED Flashlight 4 Pre-set brightness levels for maximum versatility (10, 30, 0.3 or 120 Max Lumens) Up to 22 Available Brightness Levels from 0.1 to 120 Lumens Choose Between Disorienting, Emergency, or SOS Strobe as Signaling/ Saftey feature Powered by (1) CR123 battery (included) Runtimes: 120 lumens/30 min., 10 lumens/14 hrs., 0.3 lumens /240hrs. Measures 3.3 inches long by 1 inch wide and weighs a mere 3.1 oz.