Features: 1. The Wearable Necklace Design And Mini Size Are Easy To Carry And Practical To Purify The Surrounding Air.2. 40 Million Per Centimeter, Creating A Fresher Personal Space .3. Very Quiet When Working, Don' Worry About The Noise When Working Or Picking Up Objects. Simple Operation, Just Press The Switch.4. USB Charging, It Can Work For A Long Time After Fully .5. Effectively Neutralize The Static Electricity Of TV And Computer, And Form A Protective Layer For The Skin.Description: 1. Product Name: Negative Ion Air Purifier2. P Negative Ion Release: 40 Million/Cm3. Applicable Area: 1m4. Rated Power: Less than 1W5. Rated Current: Less than 10mA6. Rated Voltage: DC 3.7V7. Battery Type: USB Rechargeablesize: 6 x 3cmMaterial: ABScolour: whitePackage Contents: 1 x Data Cable1 x Negative Ion Air Purifier1 x Hanging Chain1 x 1 x Chinese And English ManualOnly 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.