The Celestron SkySync GPS Accessory lets you add GPS to your Celestron computerized telescope so you can get time, date, and location downloads from orbiting Global Positioning Satellites. This 16-channel GPS module plugs into your telescope\'s hand control or the auxiliary (AUX) port on your drive base and then mounts to a tripod leg to stay safely out of the way with included straps. Features - Upgrade your Celestron computerized telescope to GPS with SkySync. - Improve the speed and accuracy of alignments with 16-channel GPS. - Automatically updates the time and date. - Plugs into the AUX port on the base of the telescope - Compatible for all non-GPS Celestron computerized telescopes. * Not compatible with the SkyProdigy range.