Works as expected. I had an issue with the first one so I emailed the contact information and they responded within minutes. After some troubleshooting, they determined it was the faulty unit and I received a replacement within a few days. This device also comes with an iPhone app that is required to access data. You don't need to buy anything other than maybe a mount to keep an eye on your phone while driving. I use a fuel economy chart which I hope will help me save gas when towing my camper.
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