Approach Tech NVR-2018 - Manual (Page 34)

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4.6 Key Lock Operation
The Key lock operation protects the unit against unauthorized use by disabling the entire front panel
controls. Simultaneously press these two “<” and “>” buttons (as shown below) for at least
3 seconds to lock the unit; to release the Key Lock , simultaneously press these two buttons again.
Power Display
Save
Enter Setup
PLAY STOP
REC
FWD REV
PAUSE
A-rec Search
T-rec
POWER DISK
11 14
Shift
Seq.
CH1 CH2 CH3 CH4
4 8
CH5 CH6 CH7 CH8