This one is built to last. The unbreakable ABS body resists chemicals, water and corrosion. The polycarbonate lens and focused Xenon lamp module produce a tight white beam that penetrates smoke and fog. The PeliLite 1800 is submersible to 500 feet, thanks to the o-ring seal and twist-on shroud that eliminates leaky switches. It is powered by 2 C akaline cells.