How do I turn on silent entry mode?

Tap the touchpad to wake it up and activate the lock face, then press and hold the (*) button for 3 seconds. The yellow LED will flash 2 times, indicating the safe is now in silent entry mode. To turn sound back on, press and hold (*) for 3 seconds again and the yellow LED will flash 2 times with a beep.

From the official Sanctuary Sanctuary Safe manual, page 10

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