I didn't see any information posted of the difference of the model numbers for the Samsung ATIV Smart PC. If this was already mentioned and I missed it, I can delete this post. I won't post the specs since all will be the same, just posting what the other models have as extra. XE500T1C-A01US comes with the following: Keyboard dock. Possible GNSS XE500T1C-A02US appears to be the white color version comes with the following: Keyboard dock. XE500T1C-A03US comes with the following: Keyboard dock. GNSS. NFC. WiDi. XE500T1C-A04US which is just the tablet and comes with the following: No extra radios are included or any extra features.