1,Breathe cleaner air: This personal air freshener will release more than 5 million negative ions, pushing pollutants away from your personal space, eliminating most smoke, cooking odors, and even PM2.5 air pollutants, thereby improving mood and Sleep. 2,Take it with you: Because this mini air purifier comes with a lanyard,it can be worn around the neck. During the journey, in public places or other places with poor air quality, wearing this kind of clothing can create a fresh air area. 3,Long-lasting: The portable air purifier has a USB charging port that can be for 40 minutes and can be used for about 8 hours to fresh air 4,Easy to use: easy to operate, just press the simple operation to enjoy air. 5,No need to replace consumables, silent operation, suitable for scenes Product name: hanging neck air purifier Negative ion concentration: 5 million pcs/cm³ Input voltage: DC 5V Output power: 0.05W Rated frequency: 50 (HZ) Control : button Battery capacity: 110MAH Charging time: 40