Features 1、RELEASES NEGATIVE IONS: The Mini air purifier continuously releases large amounts of negative ions to actively protect you from pollutants such as PM2.5, smoke, pollen, dust. 2、APPLICABLE PEOPLE: Wearable air cleaner is perfect for children, students, the elderly and other people with low body resistance, but also can relieve your air problems and so on, you can better care for your family. 3、FASHIONABLE STYLING: Travel air purifier is fashionable and can be used as a neck accessory, as well as a home and car accessory, increasing the concentration of negative ions in the environment, freshening up the air and positively affecting your health. 4、200MAH BATTERY: Wearable air purifier necklace has a built in 200 mAh battery, which can be charged via USB for a long life. 5、APPLICABLE SCENES: Wearable air purifier can be used in cars, offices, irplanes and other complex environments, so that freshing air is always with you. Specification Item Type: Wearable Air Purifier Necklace Material: ABS Size: Approx. 4 x 4 x 1.9cm / 1.6 x 1.6 x 0.75in (0.1 to 0.2cm Error in Manual Measurement) Use: Can Be Used in the Car, Office, Airplanes and Other Complex Environments, So That Freshing Air Is Always with You! Battery Model: Lithium Ion Rechargeable Batteryx1 (Shipped with Built In Battery) Battery Capacity: 200mAh Package List 1 x Wearable Air Purifier Necklace (Shipped with Built In Battery) 1 x USB Magnetic Charging Cable 1 x User Manual