Remax F21 Water Cooling Oscillating Fan is a small fan with a 4000mAh battery that can be used for a long time. It has 6 wind speeds and a water mist system, and its mini size makes it easy to carry wherever you go. Touch control and precise control, and the digital display shows the exact power remaining. It can be used to insert 360ml and has 2 types of water mist systems.