the micro usb that i have isnt the same as the 1 on the appletv 2 i have 1 that i use for my camera and its completly different to thhe port on this apple tv
micro usb is a standard. There are a variety of mini USB leads used by different camera companies.
However this does not matter if the device you are talking about is a iPod Shuffle which uses a jack to USB connection for charging and connecting to PC