Wow, really low price. However, I'm after something a little different. I'm mostly concerned running my front lip into curbs. So basically a front sensor for curbs. Also, I don't want any electronics mounted or wired inside the cockpit. If I can use an Arduino with bluetooth, I might be able to use my Idrive bluetooth to communicate. Basically mount Arduino in engine compartment and wire to sensors. Then select the the parking sensor bluetooth channel when I want to use it. The Arduino will output beeps varying in frequency to the cars audio system via bluetooth.