Smart Sense, Auto AdjustThis air purifier features PM2.5 sensor and LED display can monitor air quality in real timeso you always know exactly what youre breathing. In Auto Mode, it adjusts fan speed and color-coded air quality alerts (green=good, yellow=moderate, red=poor) to combat dust, smoke, or pollen without lifting a finger. No more guessing! Cost-Saving with Washable Pre-filterThis air purifier features a washable pre-filter that traps dust, pet hair, and large particlessimply rinse/vacuum and reuse! No need for costly replacements, making it budget-friendly and sustainable. Enjoy long-term savings while maintaining top performance.