Description Stylus Pro(tm)LED penlight features the latest .5 Watt emitter technology and Streamlight's proprietary Micro Optical System (MOS). MOS provides optimized output and run time. The .5 Watt LED has a 30,000 hour lifetime and never needs replaced. Constructed of machined aluminum with pocket clip and easy to use push button tail cap "on-off". Up to 7.5 hours of regulated run time. Delivers up to 24 lumens. Includes Black Holster and 2 "AAA" Alkaline batteries.