Even when you are on the move, you can control the air you breath thanks to this small, portable Personal Air Purifier. Hardly bigger than your MP3 player, it can hang comfortably around your neck or clip onto your shirt pocket, while it protects and cleans the air around your head from virus and bacteria. The Personal Air Purifier forces airborne pollutants away from your personal space, giving you a 3-foot zone of cleaner, healthier air. Great for use while traveling, small and compact for convience on commercial flights. It comes with 2 lithium coin cell batteries that give you 7 continuous days of use. No filters to replace or clean.