About this product Protective effect: The ions of the wearable air purifier form an invisible protective cover, which can resist PM2.5, pollen, dust, second-hand smoke and other pollutants, creating a private space. Negative ion generator: a device that generates negative air ions, removes dust and purifies the air. The necklace releases negative ions to drive harmful air pollutants away from the breathing area Multi-function: Press the on/off key for three seconds to start and shut down, and short press to switch the power. Enjoy clean air at any time, improve depression, insomnia, mood, and sleep quality. No noise, low power consumption, 5 decibel ultra-quiet operation to ensure sleep quality Stylish and convenient]: Small size and light weight. Can be hung on the neck, handbag, car trouser hook, stroller, camping or bedside table. The stylish design blends in with your clothing. Compact design for easy travel High quality: Made of lightweight materials, suitable for complex environments such as cars, offices, subways, airplanes, etc. Fresh air is always with you. Elegant and beautiful design, a perfect gift for your loved ones Color:Black Material: ABS Package Contents: 1 x portable air purifier 1 x lanyard 1 x USB charging cable Only the above package content, other products are not included. Note: Light reflection 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.