AB-COM IPBox 250S PVR User Manual - page 26
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Multi Selection Mode
In case that you wish to hide the several channels continuously, press the right direction
button and then insert the password to hide one by one.
11.2.3. Lock
Select the channel you wish to lock by moving the high-lights and then move to “Lock” by
pressing the right direction button. Press OK button to bring the PIN box. A “lock icon” will
appear right next to channel name. The channel with lock icon can be un-locked by
entering PIN Number again.