Features: LED time display (time display 0:00) There are 3 brightness levels (default is medium brightness) Night mode with automatic dimming. Three function buttons in total: mode, up and down Time display in 4 positions in total (12/24 hour mode). Al alarm is displayed at 6:00. Alarm with sleep function Sleep function, 5-60 minutes (default interval is 5 minutes) Power supply: 5V (excluding power adapter), CR2032 button battery (excluding) for backup setting, USB cable (included) Time setting: Press mode for 3 seconds to enter the time setting. The setting sequence is hour minute. Alarm Settings: In alarm mode, press the mode key for 3 seconds to enter the time setting. The setting sequence is: when the sleep time is set, Al " will light up. When the alarm sounds: Press mode to activate the sleep function. The Al icon will flash. Or press to deactivate the alarm. The Al icon will close. Night mode: In night mode, the clock will automatically reduce the LED brightness and press mode