Sealing Design: This humidifier adopts a sealing design, which prevents water from entering into the humidifier after soaking, so as to avoid accidental short circuit. Low Noise: The general noise of this humidifier doesn't surpass 30 decibels, making you rest soundly around evening time. Tankless Humidifier: This humidifier does not have a predetermined container because it does not have a water tank. Therefore, you are free to put it in any container. Long Time Humidification: The USB-connected humidifier can keep you moist for up to eight hours. Light and Portable: The humidifier is helpful for vacations, outings, and trips that it is and simple to .