Features:  Compact size, neck-hangs design, lightweight and portable, purification airs wherever you go.  Adopts intelligent Al chip ensures that the purifier can stably release negative oxygen ions, circularly purify and breathe freely.  Low interference, low noise, low maintenance costs but can provides long service time.  2 operation modes design, you can adjust to high gear or low gear according to your demands easily.  Releasing 12000W anion/cm³, it can effectively remove dust, PM2.5 and formaldehyde in the air.  Rapid air purification in few seconds, with 60 hours of strong endurance, protect your free breathing.  The double negative ion generators have no filter net to purify the air fresher, and the 0 consumables are more environmental friendly, and purify the air for a long time.    Specifications:  Name: Negative Ion Generator  Material: ABS+PC  Battery: 1 * 5V, 700mAh battery (included)  Input voltage: DC5V  Power: ＜1W  Electric content: ＜50mAh  Concentration: 8,000-12,000W/cm³  Recharging interface: Type-C  Item size: 80 * 35 * 23mm / 3.15 * 1.38 * 0.91in  Item weight: 48g / 1.69ounce  Package size: 160 * 95 * 33mm / 6.30 * 3.74 * 1.30in  Package weight: 158g / 5.57ounce    Packing List:  1 * Negative Ion Generator  1 * Guideline