You are buying an unused HP TMA Scanner adapter used in a range of scanners.  It is used to scan 35mm film negatives and Slides when plugged into the main scanner unit.

Check if its compatible with your scanner before you buy. Also check the plug shown in one of the photos to see if its the same as the socket on your scanner

Lock at the photos to see what's included and their condition.

No Returns given for incorrectly bought parts.