Solar Road Stud energy in aluminum with option of fixed or flashing light in red, yellow, white, green and blue.Rechargeable 1.2V 600 NI-MH with a useful life of 3 years.Dimensions:104x104x20 mm.Temperature operative: ¨C 20¡ã -75¡ã C.Options: or flashing from one side or both sides.All parts are sealed with epoxy resin sealant.