Well you can. And It will emit light for 10 years! Don't worry about the radiation, it's safe. A traditional fire alarm in your house emits 2X's the radiation that this keychain emits. How cool is it to have a glowing crystal on whatever you attach it to. I plan on getting a few and putting them on whatever I can. My keys, My laptop, Cellphone, I hope to set off sensors at border stations, airports and court houses. I kid, I kid, but I do wonder... Check them out here.
