This small unit is a USB powered mouse replacement, used to control your PC cursor using up to 5 of your switches: Up/Down/Left/Right/Select. It is compatible with all versions of Microsoft WINDOWS.
It also has a 9 way D type connector, making it very easy to connect up to a Controls Dynamic DX ECU relay module, or a Penny+Giles Drive Technology R-net I/O relay module.
The USB connector is a “B” type socket.
The “D” type is a male pin socket.