Controls Operator controls are an important function of any materials handling system. They provide the means for a load to be moved up/down, forward/backward, or side to side. There is a variety of power sources available including Manual, Electric (most popular), Pneumatic and Hydraulic. Types of Controls - There are several different types of controls available for maneuvering the direction of a load or process. We have featured a few of the more common types such as Pendants, Radio Controls, Cab Controls and Automatic Dispatch Systems.