Fermax DT591 User Manual - page 14
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6.3 Unlock Time Settings
1)Power-on within 5 seconds;
2)Press and hold "B" button for 3
seconds, it will enter the setting the
state of prepare.
Indicator Buzzer
beep+,beep
(flash)
Press and hold "A" button for 3
seconds, it will enter the state of
unlock time setting.
Indicator Buzzer
beep+
(off)
At this time press and hold "B"
button,timing starts; release "B"
button to end the timing. The time of
press and hold "B" button equal to
unlock time.(Timing Unit: 1s)
Indicator Buzzer
beep once
per second
(flash once per second)
The unlock time can be set to 1~30 seconds. The default is 1s.
Note: In all steps, if there isn’t any operation within 5s, or press Call button, it will exit the
setting.