The PREMIER EQUATORIAL MOUNT are designed essentially for a long-exposure astrophotography. They precisely control the telescope’s tracking speed to compensate for the earth's rotation during long exposures of celestial objects. Available in 2x, 4X and 8X speeds through the Hand Pad Controller. These DC motor drives run on 4 "D" cell batteries (not included). Motors for both axis, clutches, cables hand controller, and battery case are included