Style shown is for pre-2002 Teleports. Simpler, less expensive, easier to install ones fit later scopes.

The complete Sky Commander system for a new Teleport includes:

1. Sky Commander, encoders, & cable
2. Encoder mounts (pair)
3. Encoder installation & testing

To add it to an existing scope yourself, just order the first two parts. If you already have a Sky Commander or other compatible computer, substitute the "Encoders only" for the "Sky Commander & Encoders".