NOKIN Synchronous Flashing Solar Road Stud Light Highway Features1) Solar Road Stud Suitable for edge line of road and pavement2) Can use over 180hrs in the foggy or rainy day after fully charged.3) Solar Road Stud Can work more than 3 years normally4) Energy saving and environmental protection5) Fix firmly the product by epoxy resin glue or screws6) NOKIN R1 Solar Road Stud can load