Included in your purchase will be a set of 1.2m (4') to connect the control box to the motors. These are long enough for most common installations, where you would regularly place the control box under the pedals plate (for H2, H3, P2 and P3 models) or under the seat (for H6 and P6 models).
As a result, the Cables extension set is only needed for the customers who, for some reason, wish to place the control box further away from the platform.