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.