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For your question about whether to use the bluetooth for playing your music... I recommend using a USB cord or AUX cord, only because teh...
If you're set on a back up cam your best bet, which has been stated before, is to get an aftermarket camera... It's great if it's in the rearview...
You shouldn't have anything to worry about. The Prius is built with safety in mind, not only your safety, but the saftey of the hybrid components...
