Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Ex Input:
Product received timely. The plug in feature is favorable in that there is no concern of battery failure. Product is easy to use.

Ex Output:
Positive

Ex Input:
The case I had didn't fit properly - the window obstructed the rightmost side of the display. You could shift it over, but it would always shift back. I don't know if they are all that way (maybe I got a bad one?), but I didn't want to buy another one to find out.

Ex Output:
Negative

Ex Input:
This product would not even turn on once batteries were installed! It also has a terrible chemical odor which would probably cause most health conscious people not to risk actually using it anyway!Please be aware you cannot return so order at your own risk!

Ex Output:
Negative