To turn off your Litter-Robot 3, simply press and release the Power button. This will shut the unit off.
That's the direct answer. However, here's a little more context that might be useful:
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The Power button is the primary control for turning the Litter-Robot 3 on and off.
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When you turn the Litter-Robot 3 back on by pressing the Power button again, it will typically initiate a clean cycle.
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If you're wanting to enter night light mode, that involves a different button sequence: press and hold the Power button while the Litter-Robot is in the home position.