Extra features: alarm clock and timer Notice： The four-digit model does not require installation at all, and the six-digit model requires simple assembly. Common Questions: Q: How does this clock read the time? A: If the number shows 18.30, that is 18:30. (Also supports 12-hour clock) Q: Is this clock charged or plugged in? A: This clock is powered by a USB interface, with a USB power supply and a TYPE-C charging cable. Q: Does the time need to be reset after the power is off? A: There is a button battery on the motherboard, and it will continue to run when the power is off. You don’t need to reset the time when you plug it in after the power is off. Q: Is it convenient to adjust the time with this clock? Do I need to use a computer to set it? A: The clock is equipped with a special] time setting button, which can set the time very conveniently, without the complicated setting of the computer. The built-in clock chip is very accurate, and there is no need to adjust the time frequently, simple and worry-free! Set time 1.Press and hold the ② button to enter the time setting. At this time, the two numbers on the left flash. You can adjust the hour by pressing the ③ button and the ④ button. 2.Short press the ② button, the two numbers on the right flash, at this time, you can use the ③ button and the ④ button to adjust the minute. 3.Short press the ② button again to enter the alarm clock setting mode (the red 8888 means the alarm clock is off). At this time, the left side flashes, and the hour of the alarm clock is set by the ③ and ④ keys. Similarly, short press the ② button again, and the right side flashes. At this time, you can use the ③ and ④ buttons to set the specific minute of the alarm. 4. Finally, short press the ② button to complete the setting.