World's Smallest Submersible Strobe This personal-sized Xenon strobe will operate for 6 hours on 1 AA alkaline battery or 10 hours on a Energizer® e2® Lithium battery. Use it for diving, fire fighting, mountain climbing or emergency marine use. Visible for more than 1 mile at night at the surface. Available with your choice of 4 lens colors. Clear, Amber, Blue, Red, Green, and Yellow. Comes with a Velcro strap.