Function: efficient dust removal, PM2.5,bacterial,Efficient addition of formaldehyde, suitable for decoration The replacement of the spare parts will help your Air Purifier maintain the good cleaning performance. Each spare parts is recommended to use for six months, and then replace the new part spare. Type: Air Purifier Parts Version: Standard Edition Product Shape: 360-Degree Barrel Filter Recommended area:Recommended area: 28 m-49 m Colour:blue Material:plastic Package Contents: 2 x air filter element 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.