A controller comprising: a housing including a front , a back and at least a first side and an opposing second side extending between the front and the back ; a printed circuit board housed by the housing ; an electrical connector electrically connected to the printed circuit board , the electrical connector including a first spring contact , a second spring contact , and an electrically conductive bridge mechanically and electrically connecting the first spring contact and the second spring contact , wherein: the electrically conductive bridge is housed by the housing ; the first spring contact extends outside of the housing and is accessible from the first side of the housing ; the second spring contact extends outside of the housing and is accessible from the second opposing side of the housing ; characterized in that the electrical connector further comprises a first terminal pin and a second terminal pin , wherein the electrically conductive bridge mechanically and electrically connects the first terminal pin and the second terminal pin , wherein: the first terminal pin extends outside of the housing and is accessible from the first side of the housing ; and the second terminal pin extends outside of the housing and is accessible from the second opposing side of the housing . a housing including a front , a back and at least a first side and an opposing second side extending between the front and the back ; a printed circuit board housed by the housing ; an electrical connector electrically connected to the printed circuit board , the electrical connector including a first spring contact , a second spring contact , and an electrically conductive bridge mechanically and electrically connecting the first spring contact and the second spring contact , wherein: the electrically conductive bridge is housed by the housing ; the first spring contact extends outside of the housing and is accessible from the first side of the housing ; the second spring contact extends outside of the housing and is accessible from the second opposing side of the housing ; characterized in that the electrical connector further comprises a first terminal pin and a second terminal pin , wherein the electrically conductive bridge mechanically and electrically connects the first terminal pin and the second terminal pin , wherein: the first terminal pin extends outside of the housing and is accessible from the first side of the housing ; and the second terminal pin extends outside of the housing and is accessible from the second opposing side of the housing . the electrically conductive bridge is housed by the housing ; the first spring contact extends outside of the housing and is accessible from the first side of the housing ; the second spring contact extends outside of the housing and is accessible from the second opposing side of the housing ; characterized in that the electrical connector further comprises a first terminal pin and a second terminal pin , wherein the electrically conductive bridge mechanically and electrically connects the first terminal pin and the second terminal pin , wherein: the first terminal pin extends outside of the housing and is accessible from the first side of the housing ; and the second terminal pin extends outside of the housing and is accessible from the second opposing side of the housing . the first terminal pin extends outside of the housing and is accessible from the first side of the housing ; and the second terminal pin extends outside of the housing and is accessible from the second opposing side of the housing . <EOS>