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It is installed on the Dec rotation axis of the AP mount system to move the mount electrically with the STAR BOOK ONE controller.
The basic AP mount system comes standard with both the R.A and Dec manual slow motion control modules. By adding the DEC motor module to the AP-SM mount, which comes equipped with the R.A module, it can be upgraded to a compact and versatile platform both for visual observing and astrophotography.
The DEC motor module is essential to upgrade to an AP Mount System that moves with dual-axis motor drive. The Dec motor can be feeded with the electricity from the battery compertment on the AP declination body.