These are the very best mirrors built exclusively for E-Bikes. Busch & Muller is renowned for their excellence in bicycle components. The 701 mirror is a bar-end left-hand only mirror that is built to withstand sustained wind and road vibrations.
The mirror plugs into the end of the handlebar and is tightened with an allen bolt. The mount pivots on a vertical axis just outside of the handlebar, so that if you get too close to that bus, you know, that bus you're passing on the right and the driver turns into the bus stop? Yeah, that bus! Well, when you hit the bus, or the bus hits you (We don't have to have that debate here. I've got a forum on Google for that.) the mirror can pivot on that vertical axis and is far less likely to be damaged. You just swing it back into its normal position. It will just click into proper alignment. Pretty nifty, I'd say.