Product Name : Air Purifier Working hours: 20-24H Charging time: 1H Applicable Area: 10㎡ Function : Air purification Working Principle: Negative ions colour:Silver material:ABS size:4x7x2.7cm Package Contents: 5 x hanging neck purifier Only the above package content, other products are not included. Note: Light 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.