1. Lightweight and portable: This air purifier is small in size, easy to carry, and can be hung around the neck. No matter where you are, you can take it with you to help you breathe fresh air and protect your health.2. Effectively purify the air: The mini air purifier releases more than 50 million negative ions per cubic centimeter to remove dust in the air, effectively improve nasal congestion, protect your free breathing, and purify the surrounding air in daily life. Eliminate odors: smoke, pets, food;Remove allergens: pollen, dust, pet dander and mold spores.3. Safe and no noise: It is very quiet during operation, and there is no need to worry about noise when working or resting. The operation is simple, and it can be turned on and off with a button.4. Long-lasting and effective: using USB to charge, it can work for a long time for up to 15 hours after being fully charged. No matter where you go, you can wear it around your neck to breathe fresh air at any time. Create a protective area, and the released negative ions push pollutants away from your breathing zone.5. Multifunctional purifier: This advanced miniature air purifier can capture dust, smoke, unpleasant smells and other harmful pollutants in the air. It can be hung on the neck, trouser hook, handbag, stroller, camping, hung on the wall or placed on the table. Your personal air purifier necklace can be used for many occasions, from leisurely outings to relaxing at home. This cute necklace is an intimate gift for yourself, your family, friends and lovers.Type name: Portable Negative Ion Air Purifier NecklaceBattery capacity: 250 mAhApplicable temperature: -10-50Sterilization principle: ozonecolour: greenMaterial: ABSSize: 5x5x1.5 cmPackage Contents:1 x Host1 x lanyard1 x USB data cable1 x Multilingual manual(Chinese, English, Japanese, Korean, French, German)Only the above package content, other products are not included.Note: Light shooting 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.