Suitable for 30-50 square meters Touch screen. The screen has an air condition status telling. Have sleep mode Reduce the screen display automatically Not disturb sleep Low noise at only 40 dB Electric power 35W Multiple filters for fresh air Save energy Can set the time to open - close, can leave the house comfortably without worry. Can prevent pm 2.5 dust / germs / bacteria / dust / virus / allergens / cigarette smoke / odors / dust mites / fog Warning!!! The filters is unwashable, It is recommended to replace it after 3-6 months of use.