These combination tail light and stop lights feature 16 high-quality, low-draw LEDs, so they reduce both the weight on your bike's rear fender, and the load on the electrical system. So compact they fit any rear-ward surface, yet large enough to provide good lighting. Easy installation, and features a tough, high impact, all-weather case. Features a thick, solid, non-flexible backing with two fixed post bolts for mounting. Augment or replace your bike's tail light. 12V. (4.3"x.75"x.75")