Graco 2M13 - Digital Imonitor Mini Baby Monitor Owner's Manual page 19

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To adjust the level at which the vibration alert is activated, press
and hold the "Vibe" button on the side of the parent unit. The
sound lights will illuminate to show the vibration alert adjustment
setting. Press the volume UP/DOWN switch to change the setting.
A lower sound light setting will make the vibration activate for
quieter sounds. A higher sound light setting will make the vibration
activate for louder sounds. When the sound in the nursery goes
above the sound light level you choose, the vibration alert will be
activated.
To adjust vibration
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NOTE: Vibration will
automatically shut off when
parent unit is in dock.