D70s remote cord?

Just having a close look at the D70s remote cord.
It has what appears to be 4 or 8 pins, as it is only an on/off switch does anyone know why there are so many other pins or what they are there for?
It has what appears to be 4 or 8 pins, as it is only an on/off switch does anyone know why there are so many other pins or what they are there for?