Besides being somewhat dim, most keychain lights have batteries that only last a couple months before needing to be replaced—which often never happens since nobody has watch batteries lying around. But what if you could have this Mini Tritium Keychain, which lasts about 10 years without needing to be replaced? If you're worried that keeping something radioactive in your pocket next to your gonads is a bad idea, keep in mind that the particles emitted are supposedly so weak they don't even penetrate your skin. Also keep in mind that science has been wrong about stuff before. [DealExtreme via Gear Diary via Oh Gizmo]

Send an email to Jason Chen, the author of this post, at jchen@gizmodo.com.