Powerful 3-Stage Filtration: Includes ultra-fine pre-filter, True HEPA filter and activated carbon filter for enhanced odor reduction. Features a long-lasting filter with a whopping 4320 hour run-time (~180 days). Important: The included filter (located inside the air purifier) ships with a protective plastic sleeve. Please remove the plastic sleeve from the filter before use. Smart Air Quality Monitor and Filter Change Indicator: Features a built-in sensor that measures and displays air quality level (blue, green, orange or red) and automatically adjusts the fan speed (low, medium or high) in real-time. This compact and clean white appliance also includes a helpful reset indicator that flashes to let you know it’s time to replace the HEPA filter. Modern Design with Sleep Friendly Features: Measures 15.5 inches high and 8.7 inches in diameter, and features a 360-degree aerodynamic air intake to maximize purification. Operates more quietly than other air purifiers, with a max noise of 52 dB on its highest setting. Includes warm night light with customizable brightness levels, as well as a built-in timer for added convenience. Final sale