Title: This thing is GREAT!
Product review: I was leery of this because of price, but the others who said it was fine made me try. Thankfully if you read the others here who warn you about the instructions, and show some great pictures, this works fine. You do need to read the instructions. It took a little while to get the sensor right, this is where the pictures helped a lot. I got it working, tried it out in front of the house and it said I was only going 15mph. I thought I must have entered the wheel size wrong, so I took the GPS unit out of the wife's car. It showed the same speeds exactly, so there is nothing wrong with the unit, I am just not going as fast as I thought I was.
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