Features: 1. The Wearable Necklace Design And Mini Size Are Easy To Carry And Practical To Purify The Surrounding Air. 2. 40 Million Per Cubic Centimeter, Creating A Fresher Personal Space . 3. Very Quiet When Working, Don'T Worry About The Noise When Working Or Picking Up Objects. Simple Operation, Just 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 Purifier 2. P Negative Ion Release: 40 Million/Cm³ 3. Applicable Area: 1m³ 4. Rated Power: Less than 1W 5. Rated Current: Less than 10mA 6. Rated Voltage: DC 3.7V 7. Battery Type: USB Rechargeable size: 6 x 3cm Material: ABS colour: white Package Contents: 1 x Data Cable 1 x Negative Ion Air Purifier 1 x Hanging Chain 1 x 1 x Chinese And English Manual Only 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.