1、Efficient: Efficient purification system, this necklace air purifier can purify about 1m³ of your space anytime, anywhere, and you can enjoy breathing completely natural and healthy air. 2、Portable: This mini purifier is only 30g/0oz, and there is a lanyard in the package, which is convenient to carry around, it can be hung on your neck, hand, bag, trouser hook or put on your desk. 3、No Noise: The working sound of this air purifier is very quiet (less than 25dB), so it will not disturb you when you work or rest, and it can be given to friends or family as a holiday gift. 4、USB Rechargeable: Portable neck purifier can be charged using any USB port, it has a built in 250mAh battery and can be used for about 12 hours when fully charged. 5、Widely Applicable: An elegant hanging neck negative ion generator, which can absorb and settle pollen, dust, second hand smoke, etc, comes with a hook, which can be hung in the car. 1 x Necklace Air Purifier1 x Manual1 x Charging Cable1 x Hook1 x Lanyard Item Type: Necklace Air PurifierMaterial: ABSCharging Method: 5V2A Micro USB Plug CableCharging Time: DC 5V/2A 0.5 HoursUse Time: About 12 HoursBattery Capacity: Lithium Battery 250mAh (Shipped with Built in Battery)