Bedded in the road surface, they are an electronic improvement on the traditional cat's eyes in that they may give drivers more than a thirty-second reaction window compared with about 3 seconds for conventional reflective devices. The intense brightness of the leds makes them easily visible at distances of about 900m under favourable conditions. Place of origin:haanxi, china (mainland) Brand name:han Model number:han04 Waterproof grade:ip68 Service life time:5years Resist compression:30 tons Luminous mode:flashing or constant Light duration:flashing type 108hours or constant type 24 hours after fully charged Color of led:white/red/green/blue/yellow/color changing Light source:4 or 6 pcs Battery:ni-mh Size:104*104*20 mm