Suggested Retail:$200. Hepa Air Purifier for Large Room, Amrobt Home Air Filter, H13 True HEPA, 4 Stage Filtration, Smart WiFi App Controlled Air Cleaner, Compatible with Alexa. Amrobt HEPA air purifier filters 99.97% of particles down to 0.3 microns and 99.95% of particles between 0.3 – 0.1 microns. Recommended for extra-large rooms, purify up to 538 square feet rooms 3-times per hour. Built in a smart particle sensor, Amrobt could detect and display the air quality level, you could know your air quality via APP in real-time. Meanwhile cleaning speed mode (Auto, Medium or High) can be adjustable according to the air quality.. 11 x 11 x 20 inches. 7 DAY FULL REFUND GUARANTEE ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 DAY STORAGE IS ALSO AVAILABLE. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.