No matter how long you've been driving, it's never too late to learn better habits. Automatic is a little Bluetooth dongle that plugs into your car's OBD-II port (found on almost any car made since 1996) and communicates with your smartphone to track driving habits, mileage, and engine problems. Best of all, if you're in an accident, Automatic will automatically alert the authorities and call your family, no subscription required.

Automatic normally goes for $100 around the web, but today you can take a $20 discount. [Automatic Smart Driving Assistant, $80]

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