1,Breathe cleaner air: This personal air freshener will release more than 160 million negative ions, pushing pollutants 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 air area. 3,Easy to use: easy to operate, just press the simple operation to enjoy the air. 4,Long-lasting: The portable air purifier has a USB charging port that can be for 2 hour and can be used for about 20-40 hours to air 5,No need to replace consumables, silent operation, suitable for scenes, adjustable gears, switch according to different environments Product category: portable negative ion hanging neck air purifier-Model: L2107 Using voltage: DC5V Power: Less than 1W Current: Less than 50mA Rated frequency:100 (HZ) Battery capacity: 500mah Two levels of negative ion concentration adjustable: 80 million/cm3, 160 million/cm3 Charging time: 2-3 hours Use time: 20 hours for high concentration, 40 hours for low concentration Charging : Type-C charging Mute: 5db Working principle: negative ion Applicable area: less than 10 Colour:black Material:ABS Size:73 x 36 x 19mm Package Contents: 1 x Air purifier 1 x charging cable 1 x lanyard Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.