Utter crap

The Blinkerei is annoying: As opposed to road users from being dazzled in rapid succession and left in the dark. As the strobe at the disco this complicates an adequate "in-eye-Keep". Not to mention that the on-phases can happen every now and then from lampposts, pedestrians, car bodies, trees and other obstacles, so you effectively exercise GAR NO signaling effect more. Not without reason such Funzeln are prohibited while driving.
And for continuous light they are simply too coarse focused to sense illuminate dazzle but all others the track with the obnoxious bright, sharp illuminated dot.
While is large and broad in the description, they would not be approved for road transport, but are a priori constructed so that they - surprise - can be attached to the top of handlebar-like objects, and virtually nothing else. (Maybe the thumb?)
Who wants to be an arrogant Strampelheini who thinks the world would have to exclusively revolve around him, goes well with these things. Responsible motorists should look for reasonable lighting.