The DREO Air Purifier 337S features 360° all-around purification with an all-direction air intake design that quickly draws in and cleans more air. Its 3-stage H13 HEPA filtration system captures 99.97% of airborne particles and effectively purifies spaces up to 1066 sq. ft. A high-precision PM2.5 sensor provides real-time air quality monitoring, while Auto Mode automatically adjusts fan speed for efficient and optimized purification performance.