3 Modes Available For Better Lifestyle. Standard Mode,Active Mode and Night Mode. 11% Quieter with Only 30dB in Night Mode (Sounds like Gentle Breeze).Using HEPA Filter with Activated Carbon Filter. Mixed Booster Fan for Better Efficiency (Inspired by Air Craft Engines) . Lower Power Consumption, Lower Cost but with Higher Efficiency. Fully Clean the Air in a 23m Square Room in just 10 Minutes. Able to Change Mode via App by connect purifier Wi-Fi. App is Partially English for iOS and Android.