An electrode assembly that includes an electrode configured to provide electrical contact with a subject's skin through a subject contact surface. The electrode includes an electrode base pad having a first contact surface on a side of the electrode opposite the subject contact surface. The electrode also includes a connector assembly configured to electrically connect the electrode to an external electrical apparatus to transfer electrical signals between the subject's skin and the external electrical apparatus. The connector assembly includes a housing having a second contact surface. The second contact surface is configured to be magnetically and electrically coupled to the first contact surface of the electrode base pad. The connector assembly also includes an electrical connector configured to connect the second contact surface to the external electrical apparatus.