LED time display(the time display 0:00) There are 3 levels of brightness(the default brightness is medium) Night mode with automatic dimming Total 3 functional buttons: MODE,UP,DOWN Total 4 positions time display(12/24 hour modes) The alarm AL display is 6:00 Alarm with snooze function Snooze function,5-60 minutes(The default interval time is 5 minutes) Power:5V(AC adaptor excluded),CR2032 button cell battery(not included) for settings back up, USB Cable(included) Time Setting: Press MODE for 3s to enter time setting, setting order: hour-minute. Alarm Setting: Under alarm mode, press MODE for 3s to enter time setting, setting order: hour-minute-snooze time. ''AL'' will light up when setting. When the alarm beeps: Press MODE to active the snooze function. The AL icon will flash. Or press DOWN to turn off the alarm. The AL icon will turn off.