What's the secret to cleaner air? Power. The more powerful your air purifier is, the more air it can cycle through and the faster it can cleanse and sanitize your indoor air. That's why your InvisiClean Aura Air Purifier features a gutsy DC motor, much stronger than the AC motors used in most other air cleaners. Result: It delivers 171 cubic feet of purified air per minute - double the output of other models in its class. Yet it uses up to 82% less energy, so you'll save money on electricity. This portable powerhouse is conveniently compact - less than a foot wide and under 18 inches tall - yet it clears the air in up to 319 square feet of living space. Plus, it runs at 4 speeds (not just 3, like other models) - Low, Medium, High, and Turbo - for maximum effectiveness. Your InvisiClean Aura Air Purifier also offers other features that boost its power and practicality such as filter change indicator, auto timer shutoff (2, 4, 8 hours), sleep mode (turns off all lights while running), and independent UV light and ionizer controls. Measures: 12.34 x 6.25 x 17.75 inches Weight: 8.9 lbs Maximum CADR: 171 CFM / 291m/h Coverage: 1,094 sq ft based on 1 air change per hour or 228 sq ft based on 4.8 air changes per hour.