Designed in California. The UVC Light and Anion that other Brands adopt to purify air could produce a kind of air pollutant-Ozone, which is especially harmful for the children and Asthma sufferers. Levoit air purifiers never use these for 100% Ozone freeAdvanced 3 stages Filtration System: Imported HEPA Filter and High-Efficiency Activated Carbon Filter capture the allergies and pets, smoke and remove 99. 97% of pet dander, dust, pollen, odor, mold, etc. Effectively improving indoor air quality and freely enjoying fresh air at homeUltra-Silent Operation: Filtering the air with lowest noise level 25db is perfect for the restful and soothing indoor environment, which is helpful to sleep deeplyHigh-Efficiency Air Purifier: Circulating room air over 4 times per hour to achieve rapid purification. Unique size and contemporary design make Levoit air purifier suitable for small, medium rooms, office and dorm, serving you both for practical air purifier and lovely decor2 Brightness Night Light: It is comfortable and cozy for rest & relaxation on the brighter setting; With dimmer setting, it is your tender protector in the dark late nightComparing the prices of other brands' replacement filter, you can save much with Levoit filters for different demand. IMPORTANT: Only use Official Levoit replacement parts to maintain product performanceSmart Filter Change Reminder: Built-in Replacement Indicator lets you know that you need to replace the filter, it is recommended to replace your filter every 6-8 months depending on the use and air qualityQuality Assurance: 2-Year and Local U. S. Customer Service based office plus lifetime support from LEVOIT. CARB Certified -Compliance with California's stringent standards for indoor cleaning device, ETL/FCC Certified