I love my air purifier. It changes from blue(great quality air), orange for its okay air and red for really had air quality. even when something is burning in the kitchen it turned red. Easy settings. SUPER LIGHT WEIGHT. it's like lifting an empty cardboard box. Its so light. I can move it from room to room without hurting my bad shoulders or back. I highly recommend.  Just pull out of box, open the inside to take off packaging and starting using in less than 5 minutes.