Fronnor Solar Raised Pavement Marker High Brightness IP68 Waterproof Solar Powered Reflector Road Outliner Solar Blinker Light 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 battery might be out because of keeping in stock for a longtime ,It's not mal-funtion,Pls install it under the sunlight for charging when you use it. The LED light come on automatically as soon as it starts getting dark every night. They have been specifically designed with road safety in mind and can help to prevent serious accidents and emit rather than reflect light. - Solar LED road studs are also know as solar raised pavement makers, solar reflective lane markers and solar warning devices. Application scenes:The light is ideal for illuminating paths, decks, docks, boats, driveways, stairways, pavements.