The sky watcher synguider auto guider can guide an equatorial mount without the help of a pclaptop improving productivity during astro photography sessions helping you to obtain perfectly round stars during long exposure times the synguider stand alone autoguider is supplied with guiding handset cable serial cable and battery pack requires 4 x d size 15v batteries or alternative switching acdc power supply meeting dc6v 12v lower voltage recommended 200ma 250ma output current 21mm