Ten years of glow, no batteries needed. The Nitestik Safety Marker uses Photoluminescent pigment technology, which absorbs light during the day to glow freely at night. Nitestik use state of the art Photoluminescent pigment technology to produce a light source that requires no batteries and last up to 10 years. Inside this Safety Marker is a rare earth-activated alkali earth aluminate-silicate, which absorbs both natural and artificial light to continuously give of light for over 12 hours in the darkness. This discharge and recharge process can last for up to 10 years of everyday usage. It is the ideal environmentally friendly light source to increase visibility when outdoors at night. It is also ideal to attach to zips and keys so they are easy to find in the dark as well as using them to find things inside a bag or carrier box. It is ultra compact and waterproof.FeaturesA light source which lasts up to 10 years without the need for batteries.Photoluminescent pigment technology - charges from natural and artificial light during the day to product over 12 hours of light in the dark.Extra long lifespan - the discharge and recharge process can occur everyday for up to 10 years.Environmentally friendly - no batteries, works from light alone.Tintet acrylic UV-protective housing - protects the inner technology.Waterproof - to 30 metres.Dimensions: L 51mm x W 10mm, Ring 23mm