Our encoder mount packages include encoders pre-installed on our Tele Vue mounts along with the cables necessary to work with your Digital Setting Circles or computer (DSC / Computer). This equipment greatly enhances your observing fun and capability of your telescope. We also sell an encoder kit (STN-4001) for existing mounts without encoders. For utmost convenience, we recommend the optional Eyepiece Caddy to hold your eyepieces within arms reach.