This is an ST-4 with the latest (as far as I know ) software/firmware upgrades, all cables, and all documentation. Comes in a foam padded hard case. The cable for the auto guider feature is currently wired for a Skysensor 2000 PC/Vixen SP DX mount, you will probably need to re-wire for your mount. I've used it for both auto guiding and imageing, works great.
$500.00 plus shipping in CONUS, PayPal add 3%, MO okay.