Mini Portable Small Fan Quiet Rechargeable Office Desktop Fan Feature Button function: first turn on the power switch on the back. Second, adjust the appropriate fan speed by repeatedly touching the front power button (low speed > medium speed > high speed). Finally, turn off the power switch on the back after use. The fan is very small and easy to carry. Perfect for use at home, office, desk or on the go. 3-speed ultra-quiet design: low/medium/high speed level​​​​. The three-speed design allows you to have more choices in different temperature environments. With a silent construction, this USB desktop fan is designed to be ultra-quiet while providing high airflow. It is best to work or sleep with you without disturbing you. Built-in 1200mAh large capacity battery (3 hours full charge), rechargeable via USB cable, compatible with computers, laptops, power banks, wall chargers and any other USB-enabled power sources. Product manual Power: 1.3W Product size: 203*95*46mm Battery capacity: 1200mAh Charging method: usb power interface Wind speed adjustment: three gears 😁 [Satisfaction First] - Customer satisfaction is our top priority. If you are not satisfied with any of our Kayannuo product, please contact us and rest assured that we will do our best to make it right. Please refer to the size chart images and product descriptions, as well as our customer feedback, to ensure an accurate fit. Button function: first turn on the power switch on the back. Second, adjust the appropriate fan speed by repeatedly touching the front power button (low speed > medium speed > high speed). Finally, turn off the power switch on the back after use. The fan is very small and easy to carry. Perfect for use at home, office, desk or on the go. 3-speed ultra-quiet design: low/medium/high speed level​​​​. The three-speed design allows you to have more choices in different temperature environments. With a silent construction, this USB desktop fan is designed to be ultra-quiet while providing high airflow. It is best to work or sleep with you without disturbing you. Built-in 1200mAh large capacity battery (3 hours full charge), rechargeable via USB cable, compatible with computers, laptops, power banks, wall chargers and any other USB-enabled power sources.