Solar road stud solar road stud solar road stud cell: single-crystalline silicon (3v,75ma) light source: super luminosity led; led quantity: 4 or 6 pcs luminous mode: varying type constant type material of light: aluminum alloy and polycarbonate work time: 108 hours above for varying type; and more than 24 hours for constant type storage battery: ni-mh (1200mah) work temperature: -25 to +75 degree c. resist compression: 30 tons waterproof grade ip>67 view distance: over 800m 11 months warranty