Buddy Personal Air Purifier University Lab Tested as seen Dateline NBC USA Made Tested at the University of Cincinnati Center for Health Related Aerosol Studies. ? Attacks germs, pollutants, allergens, and more in your breathing zone. ? Tested down to virus size range of .04 microns. ? Wearable and ultra-light. ? Battery operated (1 - CR123A battery, included). ? Lithium-Ion rechargeable batteries also available. Contact vour EcoQuest Dealer for more information. ? Airplane avionics tested. ? Maintenance Free. ? Great for air travel. . Patented miniature design. ? Advanced lonic Air Purification Please note: this is "new old stock", the battery may be defunct. See seller's other listings for a great deal on batteries and a charger for this unit.