Negative ion purifier, release high activity, small particle size negative ions, actively kill most harmful bacteria in the air. The portable air purifier is charged for 0.5 hours and can work efficiently for 24 hours to meet the purification needs of the day. You can wear it around the neck, lightweight and portable, can be used anywhere. The product does not need to add any water or liquid, beginning purify the air. Quiet below 30 decibels, no noise during use, so that your work, study and sleep are not disturbed. Gift of Love: stylish design make your surroundings more colorful, more fun. Perfect gift idea for family and friends. Product Name : Air Purifier Input Power : 0.1W Input Voltage : DC 5V Negative Ion Concentration: 10,000,000pcs / cm Function : Air purification Bacterial Reduction Rate : more than 96% Frequency: 2KHz Charging Method : USB Battery : 3.7V 200MAH Product Weight : 30g Colour: white/green Material: PC Size: 7.7x5.2x3cm Package Contents: 1 * purifier 1 * usb cable 1 * lanyard 1 * InstructionOnly the above package content, other products are not included.Note: Light shooting 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.