You are bidding on a Sony MEX-M71BT Marine Bluetooth CD Player.  The person I bought this from said it had never been used.   If you look at the harness, it doesn't appear to be used at all.   There are a few marks on the unit that led me to believe they may have tried to mount the unit but it didn't work for them.  I listed it as "used" because I didn't know for certain.