The size, output, and battery versatility of the ProTac® 1L-1AA makes it the perfect everyday carry light. At just over 4 inches, this super bright EDC fits in your pocket but doesn't compromise on brightness. It accepts a single lithium or alkaline battery, providing you with ultimate flexibility (and availability) in the field. Streamlight® Tactical Flashlight, Dual Fuel High Lumen, Series: ProTac® 1L-1AA, 3 VDC, C4® LED Bulb, 40 to 350 Lumens Lumens, Fixed/Spot/Strobe Beam, 50000 hr Average Life, AA Alkaline/AA/CR123A Lithium Battery, 1 Batteries, Black, Aluminum Housing Material, IPX7 Enclosure, 0.95 in Dia x 4.25 in L Dimensions