There are many cheap mobile air purifiers on the market. They feature several technologies appearing to be a great product on the outside. As you read more you find they cover very little area, use small LED UV lights that are ineffective, have filters that need to be replaced often, create high amounts of ozone, use a generic TiO2 catalyst, and do not have multiple ion output or fan speed settings. Always remember you get what you pay for. When you purchase an Air Oasis mobile Sanfier you receive a quality product assembled with American hands.