Sonic Alert SB1000-V3 User Manual

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2) If within 1 minute no black button on the front is pressed, then 
it will exit the Test Mode and return back to the Time Mode.
3) While in Test Mode, sliding the Outlet Switch will demonstrate 
the different functions of the clock.
4) After you are finished with the Test Mode, press any button 
(expect the Snooze, Time and Lamp buttons, which has no 
effect) it will exit the Test mode immediately.
time