ChinaDisinfectionDeviceFactory Features 1. Large Volume Air Flow: Release millions Negative Ion to purify air in a cubic meter. 2. Long-lasting: About 7 hours usage time after full charging. (Depend on actual air condition) 3. Negative Ion Concentration: Eliminate micro-pollutants within one cubic meter around you. Negative ions promote metabolism, refresh the brain and relieve motion sickness symptoms. 4. Neck hanging available: This product can be used for hanging necks, in vehicles, and purifying the air around you to form an invisible air filter barrier. 5. Super lightweight: Only 22g lightweight, does not put any pressure on your neck. Give you a totally new and comfortable experience to enjoy the fresh clean air. The principle of negative ion purify function Negative ions are released into the air using a built-in carbon fiber brush system. The released negative ions attach to air molecules and unclean particles in the air, making them negatively charged. The negatively charged particles repel each other, fly away from your breathing space, and are attracted by the nearby positively charged surface, forming a large particle that will sink to the ground by gravity, so as to avoid entering your mouth and nose.ChinaDisinfectionDeviceFactory website:http://www.nbysolen-tech.com/disinfection-device/