Epson Trume TR-MB7 User Manual page 52

MB73 (TR-MB7) User's Guide
B
When you want to change the settings, hold down the B button for approximately
three seconds
The small second hand changes to + or -.
C
Press and release the A button
Returns to the time display.
Adjusting Time (Receiving GPS Satellite Signals) (TIME)
3 sec.
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