Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't work at high altitude/in desert

We had problems with this toy after 1 day. If it is not completely filled with helium it doesn't have enough buoyancy to raise itself up. This may be due to the fact that we live at 4200 feet and in the desert (20% humidity). But since we aren't going to go to the store every day to refill it, it's not very practical. We actually bought 2 of these because on the first day, the front and back doors happened to be opened simultaneously, and a gush of air pushed it right out the back door and it floated away too quickly to retrieve it.