Ni-Glo is a rechargeable, self-glow marking device. Batter free, safe, and non-hazardous, Ni-Glo uses exposure to sun or artificial light sources to recharge. The longer the device has been "charged," the brighter Ni-Glo will be and the longer it will last. Attach it to your keys, backpack, tent, pet, or even your fishing pole. Check out our great prices on Ni-Glo Solar Gear below.