It is recommended to add for a better experience, USB charging port can be powered with a power bank, laptop, adapters, mobile power sources, computers a nap without the headaches and colds caused by prolonged cool breezes. [Efficient Cooling & Atomization] you a powerful, cool, refreshing rather than to be caught off by a heatwave,Moreover, you can also add cold water or on top for a better cold breeze. The compact and handheld design is perfect for home, kitchen, bedrooms,offices, outdoors, and camping. The combination of multiple modes and wind speeds gives you more choices. [Large Water Tank & Long Lasting] It start protection and change to the natural wind when the water runs out, so you don't worry about it when you fall asleep. The water level perspective window allows you to view and control the water level at any time. The design of the water tank on the top can increase the convenience of adding water and avoid leakage. [Remote Control & Multi-Functional] In addition, the Cooling fans have better atomization technology we developed that can reduce the noise to 34 decibels. The upgraded mesh structure enhances the filtering effect. Hope it gives you a good night's sleep, Portable design with a handle for easy carrying and space saving.