A fresh car ride experience with advanced Ionic Wind Technology- Revolutionary Technology from Silicon Valley- Effective collecting particles down to 14.6 nanometer. -Auto Start Function provides you a safe and sweet driving experience. Our internal motion sensor automatically turns on when your vehicle picks up speed. - Besides using it inside vehicles, you may also choose to use Airdog Car Air Purifier in small spaces such as cubicle, bedroom, closet, etc. - work without filters, no need to change filters.