Hi, since I will be returning to the US, I am selling my two automatic Blueair purifiers. It filters dust particles, smoke and smell, and also comes with a built-in filter change meter. Both have automatic sensors and come with remote controls. Got them end of last year and have kept them in excellent condition. Filter's were changed 2-3months ago. The 550e model filters up to 60sqm. Selling for 3600rmb (bought for 6000) The 450e model filters up to 50sqm. Selling for 3000rmb (bought for 5200)