See the table below for more details on what each of BB-9E's light patterns means: 

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

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