Timeguard TG77 - Manual (Page 10)

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12. Random Delay of Programme Start and
Finish
By pressing the RND button the RND symbol appears in the top
right of the display and a random delay to both start and finish of ON
periods will result. The random delay varies anywhere between 2 and
32 minutes to give the impression that a standard timeswitch is not in
use.
13. Summer/Winter Time Change-over
By pressing the Time and ← buttons at the same time the time will
advance 1 hour and the +1h symbol will appear over the second
display. By pressing the buttons at the same time once more the
symbol disappears and the time moves back 1 hour.
To use this feature the TG77 needs to have the clock time set to GMT
or Winter Time.
14. Change from 24 hour to AM/PM Format
Press the “Time” button for around 3 seconds and both the “Time”
display and all stored programmes will be changed from 24 hour to
AM/PM format.
Press the “Time” button again for around 3 seconds and both the
“Time” display and all stored programmes will change back to 24
hour format.
After pressing the RST button to reset the unit, it will allways come up
in 24 hour format.