These dual axis motor drives, designed for EQ5 mounts, are essential in long-exposure astrophotography. They precisely control the telescopes' tracking speed to compensate for the earth's rotation during long exposure of celestial objects. Available in 2x, 4x, & 8x speeds through the Hand Controller. These DC motor drives run on 4 ""D"" cell batteries (not included). Motors for both axes, clutches, cables, hand controller, & battery case are included.