1.Plug the fan into a USB port and press the button to turn fan on and to activate the clock display. 2.Press and hold the button until the minute hand starts blinking then release. 3.When blinking,press and hold the button until the clock hands start to rotate and release when you reach the desired time. 4.To make small changes,Press the"SET" button once for each minutes. 5.The time will be automatically saved in after 6 seconds no activity. 6. After the first time setting, it will be remain if power off, no need to set again.