Timeguard NTT08 - Manual (Page 10)

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10. Advance/Override:
In operating mode Adv/ovr advances the programme
to the next change. If the output is off, it will change
the output to on, until the next programmed off
time. If the output is on, it will change the output
to off, until the next programmed on time.
A second push of the Adv/ovr button selects a
permanently on mode, where the output is on,
irrespective of the programming.
A third push of the Adv/ovr button selects a
permanently off mode, where the output is off,
irrespective of the programming.
A fourth push of the Adv/ovr button returns the unit
to operating mode, where the output will conform to
the programming.
11. Boost:
one press of the boost button will provide 1 hours
boost, after which the output will turn off.
Two presses will give 2 hours boost. A third press of
the boost button will cancel any boost period.