I am going to try and answer this one lol !!!! I bought a san disk Memory stick Pro Duo and did not realize it said on a little tag made for sony products. I was going to list in on here also I then looked on the back and it says Compatible with all Memory Stick Pro devices with use of an adapter (adapter not included) I am sure that is what it is after I opened mine I realize it was a little smaller so hopefully I helped you