The Roomba is a vacuuming robot. After its cleaning cycle is over, or if the Roomba's battery level is low, the Roomba returns to the home base to dock itself. Once it docks itself, it begins to recharge. If you would prefer, you can manually send the Roomba home to dock itself. Sending the Roomba home manually works even if the cleaning cycle is not over and the battery is not low.
Verify that the home base is plugged in. If it's not, your Roomba will be unable to locate it to dock.
Pick the Roomba up and set it down within five feet of the home base.
Press the "Spot" and "Clean" buttons simultaneously. The Roomba will now drive into the home base to dock.