Features: 1Purifies the Air: Negative ions effectively purify the air and remove PM2.5 dust harmful substances bacteria etc. 2Long Standby Time: Immerse in the forest oxygen bar fast purification. No need to worry about the power 12h long operation 1h charging time. 3Convenient to Us: Lanyard design so that it can be used anywhere but also can be hung on the bed school bags etc. 4Environmentally Friendly and Healthy: Negative ions decompose viruses bacteria etc. and organic matter produces carbon dioxide and water. 5Two Gears Design: The negative ion air purifier has two gears that can be adjusted according to your needs. Specification: Item Type: Wearable Air PurifierMaterial: ABSWeight: Approx. 121g/4.3ozVoltage: 5VCurrent: 50mAPower: 0.5WBattery: Li-polymer 230mah (included)Charging Time: About 1 HourUse Time: About 12 HoursNegative Ion Content: 50 Million Package List: 1 x Wearable Air Purifier (Battery Included)1 x Stand1 x Hook1 x Lanyard1 x Instructions1 x USB Power Cable