The Tracker 2140 is made of tough polycarbonate resin that withstands chemicals, water, and corrosion. The focused Xenon lamp module produces a tight white beam that penetrates smoke and fog. A twist-on shroud eliminates leaky switches. The Tracker can be clipped on your coat, shirt pocket or hat to allow your hands to be free to work, hike, bike or read. It is submersible which makes it ideal as an underwater marker or signal light.