Blueair 550E - 4,500 RMB - AUTO-setting (to deliver the optimal amount of clan air) - Remote Control (For pre-setting and post-setting timer) - FULL Blue Air Warranty until March 2018 (free home assistance). - Pre-Filter (for gross ambient-dust. Very useful, in order to not let the normal-dust go inside the unit and inside the 2.5 PM filter. With this pre-filter, the filter last longer!) - Filter 50% new (for PM 2.5)