Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible Item, Does Not work

I tried this item, it is practically useless. It can barely clean the air in a closet much less a 200 square foot area. Yes safe levels of ozone, that means it is so underpowered it is useless. It made no difference im my home. There is also evidence these items burst into flames and burn up!(...)Stay away from this clunker!