Difference in model of wireless keyboard

[jamminph88]

I am thinking about buying my friends old Mac wireless keyboard from him. The model number is MB167LL/A. I understand that this is not the current model that Apple is selling, but cannot find anywhere what the difference is. What is it?

 

[GGJstudios]

You can find detailed specs and differences of most Apple products, including keyboards, with Mactracker.