Handy Home 22713 Glowr Numbrs, Address Illumination System, Number 0 0.5 x 4.75 x 6.75 inch Uv stable, non-crazing, and will withstand temperature extremes of -30C to 150C Glower illumination address number 0 Up to 48 hours of illumination, without bulbs or batteries to replace Can be used in both indoor and outdoor applications, and depending where the excitable light comes from, the brighter the glow