Long-lasting Humidity Control and High-Capacity Design: This USB evaporator features a large 2-liter water reservoir and a dual-band design that ensures it continuously delivers moist air, guaranteeing long-lasting humidity control and maintaining constant humidity. Space-Saving Humidity Control: Built with an advanced humidity sensor and an automatic mode, this smart evaporator transparently adjusts humidity levels based on your environment. Quiet Operation: Equipped with advanced noise-reduction technology, this evaporator operates almost inaudibly, ensuring your sleep, work, or leisure is undisturbed for a peaceful environment. Enhanced Hydration: Improves hydration levels to create a calm environment, reduce respiratory difficulties, and improve air quality for overall respiratory relief. Dry Burn Prevention: Enjoy safe and energy-efficient operation with the automatic shut-off function, which turns off the evaporator when the water runs out, preventing any potential fire hazard.