Introduce Brand New Levoit Dual 200s Smart Humidifier! With a smart APP, easy top-fill and essential oil tray, you can easily get healthy and fragrant soothing moisture for home. Join us now! Specifications: Product Dimensions: 7.1 × 7.1 × 11.8 in / 18 × 18 × 30 cm Product Weight: 3 lb / 1.4 kg Whisper-Quiet Operation: ? 28dB Effective Range: 107-290 ft² / 10-27 m² Material: BPA-free, suitable for babies and adults Features: ? 3Liter Large Water Tank ? An operation that Lasts Up to 25 Hours, 3 Nights of Sleep ? Also A Diffuser ? Free VeSync App and Smart Controls ? Ultra-Quiet Operation ?Zero Light Pollution: The display light can be turned off completely ? 360 Rotating Nozzle ? Automatic Shut-Off Function ? ETL Certified For Safety and Reliability ? Comes with a Cleaning Brush Fuel Your Dual200s with LEVOIT Humidifier Replacement Filters LEVOIT Humidifier Replacement Filters/Levoit Water Filter Sponge Why to use: Capture and filter fine impurities and particles, to improve humidifying efficiency in a healthier way. When to change: Generally lasts 1 month depending on the hardness of water. Where to buy: Please search B09ZY9N6PD or "LEVOIT 10-Pack Humidifier Replacement Filters" on Amazon. Troubleshooting: 1. Do I need to use distilled water? Yes, we recommend using purified or distilled water to avoid white dust or possible hums. 2. How should I clean and refill the tank? Please clean your humidifier before first use and replace the water filter on a regular basis to avoid possible mold or mineral build-up.