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Is there any physical difference between the two III models? i.e. plastic colour or anything?

How will I know it's a III Pro rather than a standard III? (I assume the software can see what it is?)

PS. I sold my Track IR2 yesterday so IIIpro here I come...

I do not beleive there is any 'physical' looks different between the two.

The software will tell you that it is a TrackIR3 PRO.