Sure, you’ve got your first-aid kit complete with defibrillator in the trunk of your car, your personal underground bomb shelter fully stocked with food to last you months, and you wear full body armor and a motorcycle helmet wherever you go. But there’s still one thing that can hurt you: nuclear radiation!

The NukAlert Keychain is here to protect you from that silent, unseen killer. Encased in its tough metal body is a highly sensitive, fully-tested radiation detector that will beep like crazy if you are exposed to dangerous levels of radiation. A must-have for all of us safety nuts as well as nuclear technicians, bomb squads, and superheroes. Available now for $160, or $145 apiece for two or more.