The D-O series droid is a small droid comprised almost entirely of a single wheel, cone-shaped head, and the mechanisms to allow it to rotate and move about. They are tiny in size at 0.46 meters, and speak a less complex form of droid binary that is easier for non-droids to understand. While it is capable of speaking in basic, it is rather limited and often times garbled with a noticeable stutter. The Sith Assassin Ochi of Bestoon owned one of these droids.