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

I've read all of the Night World books, and this is a great book, but I must say, it's not L. J. Smith's best
Positive

I only used it a couple of times, a tiny bit of water leaked into the battery compartment and now it is rusted and won't turn on.
Negative

In an odd case of poor quality control, the package of eargels came with two of one of the six sizes and missing one of the others. I bought them to make my Jawbone headset fit. It's better than it was, but still not ergonomic.

Negative