Built-in 2000mAh rechargeable battery, long service for time Upgraded double for head fan, with soothing night lights, balanced output of strong wind The wind direction can be adjusted freely by 360 degrees up and down, which is to use With 400ML large capacity water for tank to long-lasting humidification Lightweight and, nice for home, and outdoor travel use Ultra-quietdesign You can hear the working sound when it is working It will not disturb what you are doing, great for night