This feature will add a "thumbshot" screen capture of the listings home page, where available, next to the directory listing. This is driven via the ThumbShots.com service and by using this feature you and you alone are responsible for abiding by their terms of service. The default setting is to not display thumbshots with listings.
If you would like to display thumbshots for all listings, then select "All Listings" from the respective drop down menu. If you would only like to display them with listings who are reciprocating your link select "Reciprocal Partners Only". To only display them for listings with premium status, select "Premium Listings Only". There is also one further option "Premium & Reciprocated Listings". This will display thumbshots with listings for both of these listing types, but not normal listings.