The Nikon SF-200 (S) is a bulk 35mm slide scanning attachment for select Nikon Coolscan scanners, including the Super Coolscan 4000 ED (scanners are sold separately). Minor cosmetic wear, good working order. Compatible with many (but not all!) slide mounts. Just so there's no surprises:

Mounts known to work: GEPE 2mm and 3mm, Revue, Agfa System G, Agfa Reflecta CS, Agfa Reflecta GR, Kaiser SR, Hama Fix, ROWI Quickslide.

Mounts that may work (see manual): WESS and Hama DSR.

Mounts that will jam: Kodachrome 1.1mm, Plastimount, and Pakon.

Includes original box and manual. Remember, this is not a scanner! It's an attachment for a scanner! You also need a compatible scanner!