Streamlight® Stylus Pro® LED Pen Light - C4® LED technology gives pen light extremely bright light. Machined aircraft-grade aluminum alloy case is water- and corrosion-resistant. Runs over six hours on two AAA alkaline batteries. Passes 1-meter drop test. Push button tail switch is easy to use. Removable pocket clip aids portability. Battery Type: Alkaline; Flashlights Type: Penlight; Power Source(s): 2 AAA (Included); Bulb Type: LED.