iRobot DIRT DOG - MANUAL 2 Owner's Manual page 10

Charging Lights
iRobot Dirt Dog's clean button light indicates iRobot Dirt Dog's charge status.
Use this chart to determine the status of the battery:
TIP: When iRobot Dirt Dog is on the Home Base (optional accessory), always
make sure that the Home Base Power and Docked lights are on.
10 iRobot Dirt Dog Owner's Manual
Clean Button Light
Solid Red
Orange pulse
Solid green
Battery Status
Battery empty
Charging
Fully charged