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Pre-filter is washable and permanent designed to catch larger dust particles. Pollution sensor communicates indoor air quality in real-time. Brightly colored LED lets you know how clean or dirty your indoor air is every minute of the day. Also features a timer and a filter-lifetime indicator. Energy efficient air purifier with three manual fan speeds plus Auto mode. Auto mode automatically optimizes the fan speed based on the level of indoor air quality. When no pollution is detected for 30 minutes the fan will automatically stop and enter Eco mode to save energy. Timer feature allows device to run 1/4/8 hours before automatically powering off. Filter replacement indicator checks both Pre-filter and HEPA filter and notifies users when to wash or replace them. 82 watt power consumption and quiet operation with noise level range from 24.4 dB to 53.8 dB. The continually operating air quality indicator senses indoor air particles and adjusts the fan speed accordingly to reduce particles.