Quieter and constant clean air delivery during sleep Night sensing mode is developed especially for your bedroom; The air purifier rapidly prepares your bedroom air for sleep and constantly monitors your bedroom air quality, delivering clean air while you sleep. https://www.jbhifi.com.au/products/philips-series-1000-air-purifier The smart air sensor can detect PM2.5 levels and boost the air purifier’s speed to deal with the pollution. The Philips Series 1000 Air Purifier employs VitaShield IPS technology with an aerodynamic design to help remove harmful gases, bacteria, viruses, and ultrafine particles as small as 0.02um in the air to keep a clean and fresh environment in your room. Whisper quiet, making it ideal for small to medium size rooms such as your bedroom