1. Automatic
    Automatic ($79.99) is an absolutely genius device that plugs into your car’s diagnostic port and transmits info to your Smartphone. It can tell you where you parked, why your Check Engine light is on, monitors your driving style, gives you tips for saving gas and it senses when you’ve been in a collision and alerts local authorities if you can’t. It works on most cars built after 1996. If you’ve got a teen driver, you may want to get one for yourself too.