REMOTE CONTROL: Use your smartphone to control air purifier from anywhere, always breathe fresh air when arrive at home; Use the VeSync app to control your air purifier to set a schedule, monitor the air quality, set a timer, change the mode, turn off the LED display and so on VOICE CONTROL: Compatible with Alexa, Google Assistant and IFTTT, power your devices without lifting a finger, Levoit air cleaner masterful control over your air quality just by speaking SCHEDULE & TIMER: Create customized schedule on APP to automatically turn on and off the air purifier no matter on which date, which period or under which mode; Its CADR rating of 135+ SMART FILTER LIFE: With smart Scientific algorithm, our air purifier can calculate the real filter life according to the filter's situation, not just simply define the filter's life with a few months, thus help to save money; Remaining filter life can be checked on VeSync app. Replacement filter is available to purchase (Search for: LV-PUR131-RF or B06XDM7LT7) HIGHER EFFICIENCY FOR LARGE ROOM: With Honeycomb active carbon HEPA filter, the purify efficiency is 30% higher and purify speed is 30% faster than other ordinary filter; air change 4. 5 times per hour for 360 sq. ft. room size. Suitable for medium and large rooms; bedrooms, family rooms and kitchens QUIET AS RUSTLING LEAVES: Filter the air with a noise level of 27 dB for a restful and soothing indoor environment, helping you sleep deeply ENERGY STAR & CARB CERTIFIED: Energy Star-certified, CARB, FCC Certified & CE & ETL Listed, this air purifier meets strict requirements and is considered to be energy-saving, and quality-assured. Note: A secured 2. 4 GHz Wi-Fi network is required 1-12 HOURS TIMER FUNCTION: Other than 3 timer options of other air purifiers, the 1-12 hour timer range gives you the flexibility to choose exactly how long you want the purifier to operate at any given time and save energy in the process Note: Alexa voice control functions have been updated after July. Ordered before July, to use these new functions, please firstly discover devices on Alexa APP or say, "discover my devices" to Alexa You can use Alexa to control your air purifier by the following voice. (Suppose the name of your air purifier is "LEVOIT") Turn on / off LEVOIT Set LEVOIT to sleep / low (minimum) / medium / high (Maximum) / auto (Automatic, Automatic Mode, Auto Mode) Increase / decrease LEVOIT Set LEVOIT display to on (open) / off (close)