Use it with a motor / gearbox of your choice. This kit has been redesigned using the Mitsubishi M51660L servo driver IC as the ZN409 IC is obsolete. This new IC is used in many commercial servo's. This kit is designed to work just like a standard R/C servo (with much greater power) using 1-2ms pulse width. It has proportional control - if you move the control pot / joystick a little, the servo moves a little. It can be used with a standard R/C receiver or with our servo controller kit. Some applications include R/C models, Robotics, Gates & Doors, Fly by wire control (with our servo controller) of things like Forward controls for outboards (steering, throttle etc), Pan & tilt of Cameras, Antenna dishes etc. Could be used as a winch for sails etc. with the addition of a multi turn pot & a winch drum. Kit includes PCB, all onboard components and a feedback pot. No case is supplied.