... Night time driving. 3, Being solar powered High visiibility solar road studFeatures:1, High visibility LEDS incorporated into the light ... help ensure safe2, night time driving3, being solar ... 1, material: aluminum alloy2, unit includes:a, solar panel: 0.2w, 2vb, 1*Ni-Mh rechargeable ... .W.(kg)0.21 Solar road stud