Polar FT4 USB stick??? HELP!

I've just recieved my Ft4 today, and i found a usb sbox, i plugged it in the computer but no response! it didn't detect any removable devices, and i don't even know what is that USB for? written on the back: polar datalink (wind)..
i'm using mac.
i'm sorry it's a technical problem but i though i might find help here :)

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