The SureFire U2 Ultra LED Flashlight is a palm sized high-intensity LED flashlight with a variable output of 2-100 lumens. Six output levels are user selectable via the ring selector on the rugged CNC machined aluminum housing. This flashlight also features electronic current regulation, for a more consistent level of light throughout the life of the batteries. The LED lamp is virtually indestructible, and delivers a brilliant white tactical level high beam that is several times brighter than much larger and heavier conventional flashlights. The U2 is a compact, versatile, rugged, and powerful. It's an excellent choice for backpacking, camping, and disaster preparedness kits.