Instruct: Classify a given review into positive or negative sentiment.
Query: Really useless product

It takes about 12 hours to 'fully charge' the thing and then after it's fully charged, it works for about 10 minutes. The product itself is just incredibly useless. It's literally a mini-portable vacuum cleaner with a windex-like spray attached to it. Why wouldn't I just get a vacuum cleaner that does a better job of cleaning and get a spray bottle? It would work better and it'd be cheaper.I don't know who wrote all the good reviews for this product, because they seriously confuse me. This thing is just incredibly useless all around. If you want to charge something for 12 hours to have it function for about 10 minutes, go ahead and buy this thing.tl;dr - it's useless and way too expensive for how useless it is. Don't buy it.