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newbie needs help

My Location
on an exploding rock
hi all,
i have just been given , a digitech card reader/ programmer, its roughly 3 to 4 inches square by 1/2 inch deep a slot at the front also a little blue light (when connected ) connects via usb, a sort of greeney blue transparant colour.
i'd like to know what it is and what i can do with it ,
any help would be most appreciated