As you asking for the CASIO STB-1000 Power Saving here I am giving you the information about the CASIP STB -1000 Power Saving

Power Saving is triggered if the watch is not moved and no button operation is performed for about two hours.

The following explains what happens while the watch is in the Power Saving mode

The Power Saving indicator changes from displayed to flashing.
The connection with the phone is cut, so Mobile Link functions are disabled. (All other functions continue to operate.)
This returns to the Timekeeping Mode


To turn Power Saving on or off
In the Timekeeping Mode, hold down the C button for about two seconds until the Time Zone Setting Screen appears.
[SET Hold] will appear on the watch display, followed by the Time Zone Setting Screen.

Time Zone Setting Screen
When the control indicator is displayed, the watch is in the Control Mode.
In this case, hold down the B button for about three seconds to exit the Control Mode. Next, perform step 1 of this procedure.


Power Saving Setting Screen
Depending on the current Power Saving setting, either [PSON] (Power Saving ON) or [PSOFF] (Power Saving OFF) will be displayed.

Press the D button to toggle the setting between [PSON] and [PSOFF].
Press the C button to return to the Timekeeping Mode.
Selecting [PSON] causes the Power Saving icon to appear on the display. The icon is not displayed when [PSOFF] is selected.