Only used this once. I purchased to go along with the Celestron StarSense AutoAlign camera system (which I'm also selling on used vic https://www.usedvictoria.com/all/39439789) so I could control my scope setup without touching it. It uses your phone, tablet, or a Windows PC and the Celestron SkyPortal app. The SkyPortal app is actually awesome and is where the bulk of the features are. It allows you to hold your phone or tablet up to the sky and see what everything is. You can simply click on an object or search for something in the huge database and the app will tell the telescope to slew to whatever you want. Sells for about $180 CAD online + shipping