I found this description on their web site for the USB control:
USB FotoControl consists of 1 USB board able to operate up to 2 push-button panels. It is installed into housings. Every electronic USB FotoControl has 6 magnetic buttons so that it can select up to 12 controls.
A standard push-button panel includes: 1 USB board and 1 FotoControl push-button panel to select the following controls: time + / - , diaphragm + / -, preliminary shutter release, shutter release, Iso + / -, mode switch, exposure meter.
The additional push-button panel can be installed at a later stage. Its controls can be programmed on demand to meet customers' needs. Furthermore the push-button panel can be reprogrammed. For this reason it can be adjusted to new equipment.