【Compact 3.1 Liter Water Tank】- This ultrasonic cool mist humidifier uses higher frequency ultrasonic atomization technology with an oscillation frequency of up to 2.4 MHz. In a finer, finer cooling spray, the diffusion is better. ​Effectively regulates air humidity and operates continuously for up to 25 hours in rooms up to 50 square feet. Maintain a stable and healthy environment and say goodbye to interrupted sleep caused by nasal congestion, coughing or dry mouth. ​Suitable for bedrooms, nur