Tritium Nite Self-Luminous Pendant Keychain

The Tritium Nite Self-Luminous Pendant Keychain contains a small glass tube containing a small amount of gas - tritium (radioactive isotope of hydrogen), the fluorescence generated, can cause your attention within about 10 meters in 30 feet. Does not require batteries, which contain material gas can shine for 25 years! And other similar fluorescence compared keychain, the biggest advantage: you can use the 100 meters underwater, can be used in harsh environments wilderness survival.Button on the key , backpack or cell phone, camping at night when they are not afraid of can not find what you want it!