Description:  Body size: 5cm * 5cm * 1.5cm.  Application area: 1m³.  Battery capacity: 250mah.  Machine net weight: 30g.  Rated power: ≤1W.  Principle of sterilization: ozone.  Applicable temperature: -10 ° ~ 50 ° C.  Main material: ABS.  Working current: 25ma.  Duration of use: 15 hours.  Charging method: USB.  Product accessories: Sterilizer.  Number of negative ions released: 1000W / cm³.  Color: Light purple, pink , black.     Features:  - It can be carried anywhere anytime, and people of all ages can easily wear it.  - The high concentration of clean negative ions keeps you in the purification range at any time and breathes safely, which is equivalent to carrying a mobile forest with you.  - High efficiency and energy saving, 35 hours of standby on a single charge, and a cubic meter of negative ion concentration reaching 10 million.  - USB charging, ordinary mobile phone data cable can also be universal, convenient for timely charging.     Package included:  1 x Air Purifier Necklace.  1 x Lanyard.  1 x USB Cable