The InvisiClean personal mini air purifier is a compact portable ionizer that small enough to be worn around your neck with the included strap. The small air purifier is designed for use while traveling in cars, trains, buses, and planes or while at home, school, or work. Using ionic technology, the mini air purifier will improve the quality of air around you and reduce the number of pollutants you breathe in. Uses negative ions that attach to particles in the air causing them to drop out of your breathing zone. Completely silent, no fans or moving parts. Does not remove odors.