Fronnor Solar Road Stud Path Raised Pavement Maker Side Walk Backyard Garden Park Decoration Light Blue Color Solar Reflectors (Pack of 2) Automatically starts to work when night falls or with the onset of inclement weather energy saving. No UV rays ,environment friendly This aluminum alloy LED road stud is naturally charged by the sun. The LED light come on automatically as soon as it starts getting dark every night. Noted : The battery might be out because of keeping in stock for a longtime ,It's not malfuntion,Pls install it under the sunlight for charging when you use it. Application scenes :The light is ideal for illuminating paths, decks, docks, boats, driveways, stairways, pavements.