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. 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. Low Noise: The general noise of this humidifier doesn't surpass 30 decibels, making you rest soundly around evening time. Light and Portable: The humidifier is helpful for vacations, outings, and trips that it is and simple to convey. Colour:White Material:plastic Size:4.8 x 4.8 x 1.3cm Package Contents: 1 x mini humidifier Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.