Wire require if your car currently does not has auto dim and only the standard mirror. Prius usually come pre-wired depending on which year models.
Please check to make sure. Base on my research the mirror might also be able to install on any standard wedge windshield mount Models but please do your own research. The auto dimming will darken the mirror automatically when the cars behind you or on the side is too bright or with high bean as well as cars from opposite direction with to bright headlight or high bean. It will then clears back to normal when the brightness reduce from cars in front or behind automatically.
I describe all items accurately and to the best of my knowledge. When possible I list the exact vehicle the part came from. I use the Hollander catalog to determine what other vehicles the part should fit, but I cannot be held responsible for its content.
You are responsible to determine if the part will fit your vehicle by checking with a dealer or other means. The item "FACTORY OEM 2012 2017 TOYOTA PRIUS V HYBRID AUTO DIM REAR VIEW MIRROR HOMELINK" is in sale since Saturday, May 16, 2020. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Interior\Mirrors". The seller is "auctiondealonline" and is located in Sunnyvale, California.This item can be shipped worldwide.