3 Built-in Air Purification Filters Capture Particles, Remove Allergens and Kill Bacteria to Improve Air Quality The carbon filter helps cleanse unpleasant odours to refresh your room?s scent. Select from sleep, high or automatic air purification modes for effective cleansing, indicated by 3 LED lights which displays the amount of air pollution in the room. An 8-hour timer can be set to automatically shut down the device to save energy. Designed to operate quietly, the air purifier produces only 25 decibels on the lowest setting, while the filter change reminder indicates when a replacement is required. Sleep, high and automatic modes provide the optimal amount of power 8-hour timer for automatically shutting off the unit at a specified time to save energy UV light kills bacteria, germs and fungi to prevent airborne illnesses Automatic setting detects pollution and automatically purifies air Soft touch controls to easily adjust mode, timer and mood lighting Power memory function