See the table below for more details on what each of R2-D2's light patterns means: 



Meaning Lights 
Out of Box Mode Blue fade in/out, red fade in/out
Idle Mode Blue/red flash
Low battery Red flash over 2 second period
Critical battery Red flash over 1 second period
Sleep / deep sleep Off
Out of Range Dim red solid
Animation right before sleep Blue and Red (Fade in and out)




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