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11. Lock-out Function for Children
Lock: In waiting state, press " Stop/Clear " for 3 seconds, there will be a
long beep denoting entering the children-lock state and the current time will diplay
if the time has been set, otherwise, the screen will display " ". And lock
indicator lights . Lock quitting: In locked state, press " Stop/Clear " for 3
seconds, there will be a long "beep" denoting that the lock is released.