Product review (1 stars): Precipitates inside. Change to brown, not yellow as subscribe.
Not quality product. 1 of 5 stick I bought is opened, it doesn't have a suction cup. In a other stick I saw some precipitates inside. When using that stick, it became brown, not yellow as described, and the banana inside fridge has got their dark spots anyway.

I don't even touch other sticks, who know it will protect or pollute!?

Now, if I return, the shipping cost will be almost the fund that I can receive back (for 3 sticks). Bad purchase at all. Chinese chemical technology is not so favor.