Feature:1. [High-Efficiency]Effectively removes PM2.5, smoke, pollen, and other air pollutants in the air by releasing 3 million/cubic centimeter Negative Ion.2. [Easy to Use]Just press the button to enjoy the fresh air. Negative Ion can help promote metabolism, activate cells, refresh your mind, and relieve symptoms of motion sickness.3. [Low Noise]Designed on the base of the principle of hydrokinetics to operate below 20dB which will not affect your work.4. [Great Gift]The air purifier makes a great and valuable gift for your friends and family.5. [USB Rechargeable]The mini portable air purifier can charge by any USB port and can last for about 15h with full charged.Specification:Description:This personal air purifier can fresh your personal space about 1 cubic meter anytime anywhere. Operates at a whisper-quiet level to contribute to a peaceful environment. Recommended for spaces around 1 sq. ft. , so it's great for personal use.Features:[High-Efficiency]Effectively removes PM2.5, smoke, pollen, and other air pollutants in the air by releasing 3 million/cubic centimeter Negative Ion.[Easy to Use]Just press the button to enjoy the fresh air. Negative Ion can help promote metabolism, activate cells, refresh your mind, and relieve symptoms of motion sickness.[Low Noise]Designed on the base of the principle of hydrokinetics to operate below 20dB which will not affect your work.[Great Gift]The air purifier makes a great and valuable gift for your friends and family.[USB Rechargeable]The mini portable air purifier can charge by any USB port and can last for about 15h with full charge.Specifications:Color: White;Gray (Optional)Material: ABS, Electronic ComponentStyle: ModernWorking Voltage: DC3.7-5V/1.5ACurrent: 15-20mA MaxCharging time: 20minWorking time: 5hBattery: 1*3.7V,180mAh Lithium Polymer BatteryNoise: 20dBNegative ion concentration: 3 million/cubic centimeterApplicable area: 1 cubic meterOccasion: Home, Travel, Office, Car, etcPackage Size: 8.2*7.4*4cm / 3.22*2.91*1.57inchPackage Weight: 85g / 0.18lbPackage List:1 * Portable Air Purifier1 * Strap1 * USB Cable1 * User GuidePackage List:1 * Portable Air Purifier1 * Strap1 * USB Cable1 * User Guide