[. . . ] LED Digital Instructions Normal Display: · Press and hold " " for one second to "wake up" the watch. [. . . ] Mode Description: Time Mode Calendar Mode Sleep Mode Hour Minute Month Press Press Date Press and hold for 1 second to wake up the watch 12 Hour and 24 Hour Display: Time Mode (12 Hour format) Time Mode (24 Hour format) Hour Minute (Hour: 1-12) Hour Minute (Hour: 0-24) Time Mode: 12 Hour/ 24 Hour Setting Hour Setting Minute Setting Hold 2 seconds Press to toggle 12/24 hour format Press Press Press to advance Press to exit Press to advance 1. Press and hold the " " button for 1 second to "wake up" the watch. In time mode, press and hold " " for 2 seconds to enter time setting mode; 12/24 hour time setting will flash. Press " " to set and advance to the next adjustable element (in this case the hour digits). " " will exit set mode. Calendar Mode: Year Setting (2004-2053) Month Setting (1-12) Date Setting (1-28, 29, 30, 31) depends on year and month Hold 2 seconds Press Press Press to exit 1. Press and hold the " " button for 1 second to "wake up" the watch. [. . . ] If no button is pressed for 30 seconds, the setting values will be ignored and the watch will return to time mode. [. . . ]