I saw this on the Internet and it looked interesting, so I got one and installed it on my Vespa, It is a battery operated LED Bright Red flashing stop light that works by a mercury switch turning it on when you do a fast or a hard stop, when stopping in a normal slow manner, they do not come on and they are so fast that I was not able to get a picture of them flashing, as soon as you come to a stop they go off. I attached them on the top case base mounting plate. I always am looking for anything that will make riding safer and make me more visable to other drivers, I think it would be a good idea for Vespa to install something like this at the factory and be hard wired into the electrical system, rather than battery opperated. In this picture they appear as 4 small white plastic bulbs just under the top case lock and red removal button.