Features: ? 3LiterLarge Water Tank ?Operation that Lasts Up to 25 Hours, 3 Nights of Sleep ? Also ADiffuser ? FreeVeSync App and Smart Controls ?Ultra-Quiet Operation ?ZeroLight Pollution: The display light can be turned off completely ? 360Rotating Nozzle ? Automatic Shut-Off Function ? ETLCertified For Safety and Reliability ? Comes with Cleaning Brush. Specifications: ProductDimensions: 7.1 × 7.1 × 11.8 in / 18 × 18 × 30 cm ProductWeight: 3 lb / 1.4 kg Whisper-QuietOperation: ? 28dB EffectiveRange: 107-290 ft² / 10-27 m² Material:BPA-free, suitable for babies and adults Fuel Your Dual200s with LEVOIT Humidifier ReplacementFilters LEVOIT Humidifier Replacement Filters/Levoit Water Filter Sponge Why touse: Capture and filter fine impurities and particles, to improve humidifyingefficiency in a healthier way. When tochange: Generally lasts 1 month depending on hardness of water. Where tobuy: Please search B09ZY9N6PD or "LEVOIT 10-Pack Humidifier ReplacementFilters" on Amazon. Troubleshooting: 1.Do Ineed to use distilled water? Yes, werecommend using purified or distilled water to avoid white dust or possiblehums. 2.How should I clean and refill the tank? Pleaseclean your humidifier before first use and replace the water filter on aregular basis to avoid possible mold or mineral build-up.