This is a kind of neck-hangs air purifier, produce negative ion, which can effectively remove smoke, PM2.5 and formaldehyde in the air. 2 operation modes design, you can adjust to high gear or low gear according to your demands easily. You can have a try. 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/cm, it can effectively remove dust, PM2.5 and formaldehyde in the air. Rapid air purification in few seconds, with 60 hours of b 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/cm 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