I am assuming that "homelink" is not standard on the Prius two and therefore you can't sync the car with a garage door opener. Any suggestions?
You can get an autodim homelink mirror on ebay for $50-60. Installation won't take more than an hour. And you can kill two birds with one stone. There are couple of recent threads about homelink mirror installation: Prius c Homelink mirror install instructions | PriusChat Auto dimming mirror installation | Page 2 | PriusChat
Or you can get a Flash2Pass unit. I have one on my wife's 2007 Mustang GT and one on my 2006 Ninja ZX6R and they work great!! I don't have one on the Prius C just yet.
Here's a link Flash2Pass Turns your existing headlight high beam or smartphone into a garage door opener