I have one of these for sale.
These are an excellent accessory for auto aligning your mount/telescope and significantly improving its GoTo accuracy.
Very easy to use and works very well.
https://www.bintel.com.au/product/ce...v=6cc98ba2045f
https://www.celestron.com/products/starsense-autoalign
Save $200 on the price of new. $470 posted