Powerful H13 Filters - A higher grade of HEPA (Rated higher than True HEPA). Breathe easy with 99.9% particle removal. CADR of 150 | Cleans up to 330 sq. ft. in 30 minutes | Perfect for Offices, Bedroom, Dorms, Baby Nurseries Features a Child lock, Filter replacement indicator, 3 Fan speed, making it one of the best in the market. Filter Replacement indicator lets you know when to change out filters 110 Volt units,