Do you also offer keyboards with mouse substitute systems?
And what do the terms TB1, TB2, TB38, TB50.. stand for in this context?

Yes, you have the possibility to choose between different systems. One the one hand, there are the separate mouse substitute systems, on the other hand the ones integrated into the keyboard. Here we distinguish between the following variants:

1.) Touchpad (identification code: MP)

• with capacitive operating principle

2.) Trackball (identification code: TB)

TB1	=	plastic trackball for stainless steel keyboards
TB2	=	stainless steel trackball for stainless steel keyboards
TB3	=	plastic trackball, diameter 16mm
TB4	=	plastic trackball, diameter 38mm, optical scanning
TB5	=	plastic trackball, diameter 50mm, optical scanning

3.) Knob mouse (identification code: KM)