You are purchasing a iPod touch 2G (left)& iPod touch 4G (right) Needs Parts or Repair.

I am basing the models off the sticker on the back which I believe is correct.  I tried charging both, the iPod 2G powers up and works fine but doesn’t hold a charge too long.  The iPod 4G (skinnier model) looks to have the battery puffed up (last picture) and doesn’t hold charge or powers on (probably because of the battery), so both may need battery replacement.  The iPod 4G also has a screen circle mark on the top right corner, may need screen replacement.  For sale as is.