Aerosols, viruses, or smoke: The Alpha series air purifier removes 99.97% of these particles with its three-layer filtration system, which includes a pre-filter, HEPA 13 filter, and activated carbon filter. A filter change indicator makes it easy to see when a replacement is needed. The device effortlessly handles rooms up to 59 m². With the auto mode featuring intelligent PM2.5 sensor technology, the performance is automatically adjusted, making it energy-efficient and effective. The changing color display shows real-time air quality. The speed can be manually set to one of four levels. Additional advantages include a timer function for 2 to 8 hours, a whisper-quiet night mode, a night light, and enhanced touch protection.