A linear actuator is a device that requires an energy source input and an external signal input. These inputs create an output usually in the form of motion that can be either rotary or linear. An Electric Linear Actuator is a device that converts the rotational motion of an AC or DC motor into motion. It can provide both push and pull movements. This movement makes it possible to lift, drop, slide, adjust, tilt, push, or pull objects with the simple push of a button. Today there are hundreds of millions of linear actuators used in the world to perform many different tasks. Electric Linear Actuators consists of a DC or AC motor, a series of gears, and a lead screw with a driving nut that pushes the main rod shaft in and out. JDR sells 12v Linear Actuators and 24v Linear Actuators.