Incredibly quiet, the 45i emits a soothing pink noise that boosts frequencies in the lower octaves, so you wake up feeling rested. The 45i includes laser sensor technology to auto-adjust fan speed and color-coded air quality rings show you how Alen is working to remove harmful particles as soon as they're stirred up. Connect the 45i to the Alen app to see air quality metrics 24/7 and control your unit remotely. Proven to improve sleep according to a peer-reviewed study by SleepScore Labs. Cleans up to 800 sq. ft. every 30 minutes. Wi-Fi enabled to monitor air quality and control from your smartphone. Auto-adjusts fan speeds based on air quality conditions. H13 Hepa filter removes 99.9% of dust, allergens, and harmful pollutants down to 0.1 micron.