The S3 Series Embrite™ Glow Fob is unique glow-in-the-dark (GITD) keychain fob, manufactured with Embrite™ glow pellet. Embrite™ is the TEC Accessories proprietary glow technology, affording the brightest, longest lasting effect available in a tiny, rugged Glow Fob. The pellet is mounted inside a protective stainless steel housing with a uniform bead blasted matte finish. When exposed to sunlight or UV light, the pellet will glow for hours - the longer the exposure time and the higher the light intensity, the longer and brighter it will glow, up to 12 hours. Comes with a snap clip and split ring.