These solar LED road studs are naturally charged by the sun. As soon as it starts getting dark the LED lights in the stud come on automatically each night. They have been specifically designed with road safety in mind and can help to prevent serious accidents and rather than reflect light. Feature - Color: Silver.- Material: plastic and metal- Size: 10.6 x 9.5 x 2.2cm- Made from qualified material, it is reliable for long time use.- Solar powered design is energy saving and environmentally friendly.- High luminous and Long lifespan- Automatically charge during daytime. Auto turn on at night and off at sunrise.- Made of poly-carbonate, this road stud is almost any situation. This stud can be used on most roadways without the fear of being crushed or damaged. An IP68 rating means this quality road stud won't be damaged by regular rain or snow fall. Specification: - Battery: 1.2V 800mAh battery(built-in)- Lighting Timeabout 72h after fully charged- Visual Distance: 1000meters - Turn on Light Intensity 500Lux- Working temperature: -20~70- Waterproof: IP 68- Lighting mode: always on / flashing- Life: 3-5 yearsPacking list: 1 x Solar LED Road Stud