Specific: Portable Folding Fan： 7200 mAH built-in battery, lightweight, easy to carry, multifunctional application, expandable height, multiple modes of use in one: countertop + floor + built-in fan storage 4-speed selection: Mini-size, 4 adjustable air streams are available by easily pressing the power button. It can be powered by a mobile power source, a computer USB port, or an AC adapter. Built-in battery: Built-in 7200 mAh battery, fully wireless when used for 5 to 10 hours, lets you enjoy the cool breeze anytime, anywhere. It can be powered by a mobile power supply, computers, and other USB ports. Adjustable speed and angle: with 4 effective and powerful settings (low/medium/high/natural), the wind speed can be adjusted freely by turning the knob. With adjustable angles, you can enjoy fresh air in any direction. Various uses: suitable for all kinds of occasions, such as office, family, kitchen, barbecue, beach, camping, hiking, tourism, etc., easy to carry.