If you have older firmware on your PCIII USB than 1.0.0.20, then you need this to update it.
This is useful for then adding the accelerator pump feature and if you want to link the lcd display etc.
I am selling it for £42 on ebay, but if you u2u me before it goes, I will sell it to locosters for £32 including UK Postage.
Non-UK it will be another £5

Cheers Martin

Hi Martin,
I'll have it!
Doug.

Sold!