This was a very quick and easy fix and it works well. I wanted a power outlet near the handlebars for my phone and Garmin. The unit cost about €11. It comes with a bracket that comes with a bracket that fastens under the mirror stem. So no drilling. The outlet has a cig socket and 2 usb. There is an on/off switch on top of the unit and there is an inline fuse. I threaded the wires through the frame to the battery. I want to make sure it works properly before thinking about wiring it to the ignition circuit.
But it was a very simple job and looks good. It works well but I have yet to find out how it handles bad weather.