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.