Besides the factors of size, design, or engine, we need to pay attention to the dust handling feature above all. Most of today's vacuum cleaner product lines are equipped with a dust removal function so that they can't come back and harm us. However, each different product has different dust removal features. So how do we know if the product is good and suitable for us? Don't worry, because in summary, in the link below: https://twitter.com/bestratedvacuum