Samsung MWR-ZS00 User Manual page 14

Locking/Unlocking the screen
Tap the Screen Lock (3sec) button for 3 seconds to lock/unlock the screen.
f You may lock/unlock the screen anytime (whether unit is on or off). f
f When the screen is locked, ( ) icon will appear. f
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2014-04-21 오후 5:25:36