1. cleaner air: This personal air freshener will release more than 20 negative ions, push pollutants from your personal space, eliminate most of the smoke, cooking odors and even PM2.5 air pollutants, thereby improving mood and Sleep. 2. Carry it with you: Since this mini air purifier comes with a necklace, it can be worn around the neck. During the journey, in public or other with poor air quality, wearing such clothes will air. 3. No noise: using advanced fans, the sound is quiet during operation, and no noise is generated during work or rest 4. Easy to use: easy to operate, convenient and fast, just press the button to enjoy air. 5. Long lasting: The portable air purifier has a USB charging port, which can be for 1 hour and can be used for about 20 hours (depending on actual usage) to air. product description: Product Name: Air Purifier Control : button Battery capacity: 200MAH Charging time: 1h Use time: 20-24 hours Working principle: negative Use environment: family, personal carry Applicable area: less than 10㎡ Function: air purification, smoke removal, dust removal Colour: color Material: ABS Size: 7x4x2.7cm Package Contents: 1 * air purifier 1 * charging cable 1 * instruction manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.