Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Would this work on an mp3 player?
Document: It is about get 1 second lag to read the card when you turn it on but EVERYTHING games movies whatever work at the speed they would on a sony card so don't worry.
First of all I was skeptical at first at how this would work for the PSP. For anyone who is wondering how it works I will explain.The actual adapter is a tad flimsy but for it being inside a PSP the entire time I don't think it's s big deal. this adapter is an incredible value overall!When you get this unit, choose the size MicroSD memory cards you want first, you are either going to use.
I've seen reviews that this works with psp devices, but I needed it to use extra micro sd cards with the pcm-d50 audio recorder. This recorder is an old design, and Sony says it only works with a maximum of 4gb. I had 32gb and 16gb cards. I've been unsure whether this would work, but after hard formatting both cards on the computer using fat32 defaults, placing in the card, and then formatting in the d50, I have 24 hrs of recording at 96kh 24 bit resolution.
had doubts about if it would but it worked after all!! and perfect it recognizes the 16 gb of both micro sd without any error! !
You can then remove the MicroSD from the adapter and connect it to your computer and began copying files.If you use two cards (&#34;RAID&#34; setup)....you would need to insert both at the same time in slots #1 and #2 respectively, then you will format the card as one.
I bought this several months ago and its still working just fine. Im using it in my psp with two 32gib micro sd cards, and iit works like a charm, I would recomend to anyone who is thinking about buyin.
I use this in my PSP 3001 with 2 16gb micro SD cards. Which gives me 29gb of space. I am using custom firmware, so I am not sure if it works worth the official Sony firmware or not, but I do not see why it would not. Warning: if you take the micro cards out of the converter make sure you put them back in the same slots, if not it want read the card and the PSP will want you to reformat.
This works well with the psp. I had trouble with it at first because my psp would not see the memory stick with two Sandisk 16GB micro sd cards class 4. The psp would say "memory stick not inserted" when I tried to format the card. You can still see that there is memory on there though through your pc and also on the psp video and game icons. I just added files in normally and it worked.
Great alternative to the standard memory cards from Sony! Arrived very quickly, 3-4 days, at no additional charge (I chose Everything But Stromboli as my seller) the packaging wasn't amazing but I didn't mind. As other reviewers have said, it is a bit flimsy, so I would advise from ejecting and putting it back in frequently. So far it has worked wonderfully, it does take your PSP a second to read the card, but it's expected if you have two MicroSD cards.
If you are thinking of buying this item, don't. It does not work. Get the real Memory Stick PRO for your gadget.
Answer: Depends on the MP3 player and if it takes memory sticks or not