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Mini Rescue Laser-light and Flare
These rescue lights are waterproof, corrosion proof (salt-water proof), and emit a light visible for up to twenty miles at night. On one 6-volt lithium battery, the small flare can signal for five hours. The larger light takes two N batteries and works for fifteen hours. That beats the hell out of a pyrotechnic flare, especially when you’re bleeding and lost.
$90 at National Geographic
($100 for the larger)

