Green Air Pro 2 Plate HEPA Alpine Air Purifier Ozone Generator NOW COMES WITH AND USES TWO PURIFIER PLATES FOR TWICE THE PURIFICATION POWER, ODOR REMOVAL, MOLD AND MILDEW REMEDIATION EFFECTIVENESS!! UV Lamp System HEPA Filter Large Backlit LCD Display, Covers up to 3500 sq.ft. Ozone Timer: 30 mins up to 3 hours