SecurityMan SVR2001 - Manual (Page 17)

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J. STEP PLAYING (STEP)
To inspect a video file clip while playing, press "STEP" button to play
it step by step (little by little). Every step displays a very short
section of a video file clip, then it pause. To return to the normal
continuous playing, press the "PLAY" button.
K. SYSTEM SETTINGS (SET/ENT)
When SVR-2001 is in the standby status, press the "SET/ENT" button to
go to the system-setting-menu page, or this button can be used for setup
confirmation.
BUTTON LOCK FUNCTION : The SVR-2001 provides the Button-Lock function
to protect from any unauthorized use of this unit. To lock all the buttons,
press the "SET/ENT" buttons for 5 times. To unlock, press the "SET/ENT"
buttons for 10 times.