This answer applies to R1 Mk3
The sleep function allows you to set a duration of time after which your unit will automatically turn off. To activate the sleep timer simply press and hold the alarm button on the rear of the RotoDial controller until you see ‘Set sleep time’ shown on the screen and then press or turn the select/volume knob to choose the sleep duration you desire.
The video below walks you through how to set up sleep mode on R1.
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