AAA Battery: 180 lumens output achieved with just a single widely available AAA battery. Portable: Easy to carry in a pocket or clipped to a hat brim with its lightweight and palm-sized Aluminum body. Simple Operation: Tail switch operation for momentary/constant on and quick mode changing (5/180 lumens). Anti-Slip: No worries about slipping out of hand easily with double helix body knurling for unique style and solid grip. Output: 180 lumensRuntime: 16 hoursBeam Distance: 60 meters Battery 1 x 1.5V AAA Alkaline Battery (Included) Size 89*15mm