【Authoritative TÜV Rheinland Allergy Care Certified】This air purifier is proven to effectively filter out allergens, pet hair, dust, smoke and etc 【Integrated Filter, Up to 99.97% Filtration】This home air purifier removes at least 99.97% allergens, owing to its integrated electrostatic and activated carbon filter 【Very Poweful & Fast Purification】This air purifier cleans a small room in only 12 minutes & 517 sq ft in 30 minutes. Its adjustable speed allows you to clean the air as fast as you'd like 【Air Quality Sensor & 20dB Ultra-Quiet】You can see your air quality index in the app. You can actually feel a noticeable difference in the air quality when the purifier is on. The noise level is 33% lower than regular air purifiers. You can dim or turn off the screen for better sleep quality Compact & Stylish Design: 4 compact air purifies are lightweight and easy to place on a desk or hidden on the room floor. Packages are exquisite. Low Energy Consumption: 1/3 lower than other HEPA air purifiers. Only 0.7kWh are needed for 24 hours of purification.