After getting so much good information from this site I thought it was time to give back. After debating where to install my sunpass mini sticker, and not finding much help on the net, on my new Prius I decided to take the risk and install it on the ceramic dot matrix by the mirror on the passenger side and it works great. Not very visible from the outside and not annoying for me or the passenger on the inside as the sun strip is quite dark. No beeps, but then again no batteries, as I don't commute that much so the almost free price was just what I was looking for.
Great; thanks for experimenting with the SunPass mini and a very helpful first post. That's where I have the regular transponder and I was wonering if the smaller, less obvious mini SunPass would work in the same spot. Welcome to PriusChat.