Works on all Celestron Computerized Telescopes! Improve the accuracy of your initial star alignments by plugging in the GPS module into your telescope"s drive base port. The SkySync will link up and automatically download the exact time, date, longitude and latitude from one of many global positioning satellites. 16-channel GPS moduleCompatible with all non-GPS Celestron computerized telescopesPlugs into your telescope"s Hand Control or Auxiliary port Links up and automatically downloads information from orbiting global positioning satellitesKit includes SkySync GPS Accessory and two mounting straps