Please note that the light source is not tritium. No everyday accessory is complete without the perfect premium keychain accessory. The T3 Series Embrite™ Glow Fob is the titanium version of our unique glow-in-the-dark (GITD) keychain tag, now made with our proprietary Embrite™ glow pellet. Embrite™ is TEC Accessories’ proprietary glow technology, providing the brightest, longest lasting glow-in-the-dark effect available in a small, rugged Glow Fob. The pellet is mounted inside the ultimate metal: a protective 6Al-4V titanium housing with a uniform pearl-blasted matte finish. Strong, lightweight and corrosion-resistant, this fob will last longer than anything else on your keychain. When exposed to sunlight or UV light, the patented Embrite™ pellet will glow for hours… the longer the exposure time and the higher the light intensity, the longer and brighter it will glow. Glow times can be as long as 12 hours! This advanced technology will outlast anything on the market. Your keys are essential to your everyday life - make them stand out. Size: S（A1, A2, A3：30mm*6mm），L（A4,A5,A6：38mm*8mm） TEC-T3 Glow Fob Features: Titanium construction Pearl-blasted finish ting-edge Embrite™ technology will outshine anything on the market (up to 12 hours when exposed to sunlight/UV light) Perfect for indoor and outdoor use Twice as bright as our original glow fobs!