Struggling with dust, dander or city smog? The Philips 600i Series air purifier's NanoProtect HEPA filter captures 99.97% of particles as small as 0.003 microns. That's smaller than the smallest known virus. With its smart sensors and AeraSense technology, it keeps an eye on the air and auto-adjusts the fan speed to keep things fresh. And Sleep mode kicks in when the lights go low, keeping it whisper quiet while you rest. Good to know- It purifies spaces up to 44 m² - ideal for bedrooms, home offices or nurseries- You can control it remotely and track filter life using the Philips Air+ app- It uses less than 12 W of power so it's energy efficient even when running all day- The compact design makes it easy to move between rooms