Boy Gift BIGWHITE Mini Portable USB Rechargeable Personal Air Purifiers, Ionic Air Purifiers,Necklace Wearable Ionizer Electronic Mask, Smell Eliminator Remove Smoke and Bad Odors (60&times;48&times;32.7mm, White BigWhite portable air purifier ,create your own personal No Smog Zone ,healthier air around your head.It has been proven to outputs clean anion ,reduce the electrostatic ,eliminate secondhand smoke and fresh air,remove PM2.5 ,improve lung function,removal of formaldehyde and peculiar smell,prevention air-condition disease ,suit for all crowd place. Latest Ionic Technology,Anion Electronic Mask negative ion 1 million -2 million exactly as nature does after a thunderstorm enhance immunity and improve health,Whatever you feel or not, the released Negative ion will always bonded with positive particles around you to keep you a clean space and improve body immunity.propels cleaner fresher air into your breathing zone Mini and fashion :It is lightest and smallest,weight 45 grams,size 48*29*60mm only, no worry about the weight.You can wear it around your neck (strap included) since it is smaller or place it freely on your nightstand so the air around your pillow is clean and free of pollutants. Long working time and convenient charge:it can standby to work at least one week ,application area less than 10 .Wear this purifier to create a cleaner zone of healthier air while traveling, in public places or in other poor air quality locations.The standard android interface allow you to avoid charging trouble since it is plug charging.There is no noise, no electromagnetic radiation, and USB charging cable is included with each unit. No Filters to Replace or Clean! What You Get: BigWhite Personal Ionic Air Purifier, USB cable(length of 70CM),Adapter(100-240V,1A),Lanyard,(length 40CM )introduction book .