What can I say about this device?
It looks as sophisticated as a high-school engineering project or some sort of mock-up before the industrial designers get their hands on it, but the Take-A-Look rear view mirror works better than any helmet fixed alternative, and to all intents and purposes can be replaced for $2.00.
It takes a few moments to fix the mirror to your cycling glasses and adjust for optimum visibility, but once done provides a virtually vibration free view over your shoulder.
The manufacturers don't even appear to have a website, so you'll have to source one for yourselves.