This is a compact and self-contained motor focuser for Celestron C8 telescopes. It is powered from batteries in the hand controller so doesn't need any extra power source. The hand controller and motor works nicely. There are instructions for fitting but they make me think there may be something missing for mounting it on the telescope. However I never got the opportunity to try this before I sold my 8" SCT so can't be sure. It is very likely something that could be 3D printed or otherwise be improvised. But because I don't know I am selling this as parts/repair.
eBay