Streamlight's Stylus Pro LED flashlight uses a .5-Watt High-Flux LED, as well as Micro Optical System technology to deliver twice the light output of the Stylus penlight. The Stylus Pro is an ideal secondary light for auto techs to carry in a pocket or on a tool belt for looking under a hood or chassis. The Stylus Pro measures 5.3", weighs 1.64 oz and provides an output of 48 lumens typical and a continuous regulated runtime of 7.5 hours.