I bought this for my PSP memory cards as it would be impractical to use the PSP as a card reader every time I need to add/remove something and that also does it advertised with a bonus: it's faster than a regular USB transfer as it's not limited by the PSP processor bus. But the one I bought didn't come with an M2 to Pro Duo adapter as stated in the product description. but I wouldn't use it anyway. In short: it's a cheap product (with quite expensive shipping if you ask) and it will be useful if you know how to use it properly :D
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