Streamlight's Stylus Pro HAZ-LO is a durable, alkaline-battery-powered penlight with a tail cap switch that offers both momentary and constant illumination and a replaceable metal pocket clip. Measuring 5.92", the small pen is easily stored uniform pockets, but provides 105 lumens and a beam length of almost 130'. The light is powered by two AAA batteries, which are included in the initial purchase, and can run for 2.25 hours. Coming in bright yellow, this penlight will be easy to spot, even if dropped beneath a vehicle during the workday.