A common utility droid, the WED
Treadwell model is characterized by a flat, treaded base providing a low center of gravity. From this extends a spindly neck and cluster of manipulator arms. The droid has goggle-like photoreceptors mounted atop a telescoping neck. Its vocabulator speaks in a warbling binary code.
The Lars family has had a stubborn dim-witted treadwell droid in their possession for over 20 years. It suffered a final meltdown in the days preceding Luke Skywalker's departure from Tatooine.