Features： 1、 1. Portable mini air purifier, can be hung around the neck, easy to carry, our purifiers can release up to 20 million negative ions, killing more than 99% of smoke, air pollen, dust, form spores and other harmful particles, low power consumption. 2、 2. Built-in negative ion generator, release 20 million negative ions, cleaning fully meets daily requirements .. Protect it from yellow dust, It, fine dust and smell in daily life. 3、 3.USB charge, long life, can be charged at any time. Zero ozone, no radiation, safer and healthier. 4、 4.The negative ion generator can effectively absorb formaldehyde, solve the air quality problems around you, eliminate second-hand smoke and clean the surrounding air. Eliminates most mites, pollen, odors, smoke, cooking odors And even PM 2.5 air pollutants, improving mood and sleep. 5、 5. Hanging neck design can be hung on neck, easy and convenient to carry. 20 million negative ions, it can be used in everyday life, subway, public transportation and tourist attractions.  6、 Specification： Power: USB charging Voltage: DC 3.7-5V / 1.5 A Power: Less than 1W Current: Less than 15-20mA Silent decibel: 25db Charging time: 30min Working hours: over 8 hours Battery model: 380MAh Negative ions: > 5x10 6Pcs/cm3 at 10cm Material: ABS Package content: 1xAir Purifier 1xData cable Package List：