Add tracking and tracking correction to all setups using Celestron CG-4 Equatorial mounts.The upper right motor drive allows the telescope to track the movement of the stars through the night sky, and the addition of a declination motor allows all four way adjustments with the supplied drive corrector hand controller.The drive system is mounted on a properly polar-aligned telescope so that objects in the field can perform visual observation or sketch. Body shooting is also possible if the mount is two-axis drive with drive correction. Celestrons dual-axis motor drive system is powered by four D-cell batteries in the built-in battery pack, the drive can be used either in the northern or southern hemisphere.To change the hemisphere (reverse the direction of the motor), flip the "N/Off/S" switch of the drive corrector hand controller hand controller can be used to move the telescope at a different speed. It is achieved by selecting the desired speed with the switch marked as 2x / 4x / 8x"; 2X magnification or magnification is used to induce stars during astrophotography. 4X speed is used to center objects in the eyepiece. 8X speed can be used for centering finder scope and eyepiece objects. This package includes RA and Dec motor, clutch, mounting bracket and hardware, drive correction hand controller, power pack.