Two time display modesMode One: 1 to 12 , Mode Two: 0 to 24 , You can switch from one mode to the other by pressing and hold the "UP" button for 3 seconds. 3 brightness adjustment levels To avoid the light too bright at night, the alarm clock is equipped with 3 brightness adjustment levels. It can adjust automatically and can also be adjusted manually,In the time mode, press the "UP" button to select the brightness level. Alarm and snooze function It has wake up function and snooze function. And the snooze time can be freely adjustedMulti-scene usage Size 21. 5*4. 5*9. 8cm; It can be placed on the desktop arbitrarily, or hung on the wall as a wall clockUSB or charging head for power supply connection The alarm clock can only work with power connected . It can be connected with USB cable or AC adapter. Both USB cable and AC adapter are equipped with the alarm clock when ship