Looking for controller for electric linear cylinder

I am in need of a off the self controller to enable me to change the throw and speed of cylinder. It also needs to allow for continuous movement. not one open and shut. But Open and shut till I tell it to stop. This is for a Halloween prop and I want to control length and speed of movement.

Do you want to control it via a knob (analog) or remotely by R/C? If it’s a normal DC linear actuator, we offer both kinds of DC Motor controllers - choose one which corresponds to the specifications of the actuator (voltage and current).