In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

[EX Q]: If you already have the DeWalt batteries his is a great addition. This fan is so convenient to use that I end up using it all the time. It moves an impressive amount of air while at the same time is quiet. A 6Ah battery runs for over 10 hours on high.
[EX A]: positive

[EX Q]: I received this chair today and definitely regret buying it. The off gasses made me and my son both sick with difficulty breathing and sore throats. There was no odor however some chemicals do not have a smell. There is formaldehyde per the package insert. Wish I had known this before buying. The reviews seemed to convince me that it was also pretty comfy but sadly I would not want to sit in this chair for More than a few minutes. It's very firm and not the chair I was hoping for. It's currently outside off gassing and will most likely keep it because I'm too lazy to pack it back up. It will probably grace the corner in spare room to torment any guests we have in the future.
[EX A]: negative

[EX Q]: That I used for several days and they worked quite well but these headphones are vastly superior. The amount of volume control on these is very precise as opposed to other products. They are vastly more well built as well. The ear pieces are slim enough to accomodate all but the thickest rifle gun stocks. The clarity of voices that can be heard is terrific given the ability to suppress loud gun reports. Buy with confidence, these really work well!
[EX A]:
positive