The Nite Tritium Glowing Self-luminous Keychain Glow Stick Ring 10-Years is completely self-powered and requires no extra energy supply、 delivering continuous light output for up to 10 years. It contains a tube of gaseous tritium that emits electrons to excite fluorescent coating to give off light. Tough plastic shell resists shock and impact for ultra durability. What&acute;s more、 it can be used 100 meters deep underwater or in extreme weather conditions. The attached key ring allows you to hang it on your bag in case of emergency. Click and order now!                                    <p>Features</p>            <ul><li> Completely self-powered、 require no extra energy supply</li><li> Deliver continuous light output for up to 10 years</li><li> Contain a tube of gaseous tritium that emits electrons to excite fluorescent coating to give off light</li><li> Tough plastic shell resists shock and impact for ultra durability</li><li> Can be used 100 meters deep underwater or in extreme weather conditions</li><li> Attached with a key ring for added portability</li><li> Great for marking your keys or equipment during darkness</li><li> Small and light、 easy to carry </li></ul>                                                            <p>Specifications</p>            <TABLE class=ke-zeroborder cellSpacing=0 cellPadding=0 width="100%" border=0><TBODY><TR><TD width=131>Material</TD><TD width=365>Plastic !#!amp!*! Stainless Steel</TD></TR><TR><TD width=131>Water Resistant</TD><TD width=365>100 meters</TD></TR><TR><TD width=131>Lamp</TD><TD width=365>23mm (Clear Vision with 10 meters in Darkness)</TD></TR><TR><TD width=131>Dimensions</TD><TD width=365>(1.89 x 0.39)" / (4.8 x 1)cm (H x Dia.)</TD></TR><TR><TD width=131>Color</TD><TD width=365>Blue</TD></TR><TR><TD width=131>Quantity</TD><TD width=365>1 piece</TD></TR><TR><TD width=131>Weight</TD><TD width=365>0.28oz / 8g</TD></TR></TBODY></TABLE>                                                            <p>Package Includes</p>            <ul><li>1 x Nite Tritium Glowing Keyring</li></ul>