Today’s emergency electronics help ensure a timely rescue of those lost at sea. Despite these advances, the news is still littered with stories of vessels that go missing. The possibility for electronics to fail or be lost is one reason why marine safety electronics provider ACR is releasing the Hot Shot Signal Mirror ($20), a modern iteration of the signaling mirrors distributed to members of the U.S. Navy during World War II. Four by 2¾ inches, the plastic-encased mirror boasts a built-in viewing window that allows you to direct the sun’s reflection to a passing ship or plane. In low-light situations, an attached U.S. Coast Guard-approved whistle alerts rescuers, and a float prevents the mirror from sinking if dropped. It’s a simple item, but it’s stood the test of time for one reason: It works.