An electronic speed controller including a cabinet, a display and dialogue module, and a control bus connector. The cabinet includes an electronic control/command assembly. The display and dialogue module is disposed at a front face of the cabinet and includes a communication connector linked at the rear of the display and dialogue module to the electronic control/command assembly. The control bus connector links the communication connector and the electronic control/command assembly. The cabinet supports either (i) the display and dialogue module directly connected by a rear connector to the control bus connector or (2) one option module including a through connector with a rear part directly connected to the control bus connector and a front part directly connected to either the rear connector of the display and dialogue module or a rear part of a through connector of another option module.