Wearable necklace air purifier mini portable negative ion generator low noisefeature: Efficient purification: This ionic air purifier releases more than 3 million negative air purified by ions to remove pollutants in the personal space. It is scientifically proven that it can effectively purify dirty air through indoor air and harmful substances (such as pollen, dust), second-hand smoke, mold, formaldehyde and even PM2.5 air pollutants, thereby improving your mood.Benefits: Negative ions exist in waterfalls, forests, and beaches in high concentrations, and have many positive effects on the body's physical and mental health. Inhaling negative ions has a relaxing effect, relieves tension, and brings you a good mood. Portable and durable: This miniature air purifier is simple and compact.It can be hung on the neck or on the car. It is very elegant and can be used to create clean and good air areas in travel, public places or other places with poor air quality.Let fresh air accompany you forever.Noise-free and easy to use: The sound is very quiet during operation and will not disturb you when you work or rest.The operation is very simple, you only need to press the button for two seconds to enjoy the fresh air.This air filter necklace is durable and lightweight, and can be hung on the neck or in the car. Whether you are traveling by plane, train, bus, gym, crowded elevator or office, you can wear it and enjoy safe, clean air.The perfect gift for children, pregnant women, allergies, people who hate smoking.specification: Product Type: Negative Ion Air PurifierProduct material: ABS Input voltage: DC 5VInput power: 200MAH reduction rate:> 96%Negative ion concentration: 20 million pcs/cubiccentimeterCharging method: USB Working time: about 24 hoursProduct size: 40 x 27 x 70mmColor: black, white, silver plating The package includes:1 x negative ion air purifier1 x USB cable1 x user manual