A slidable magnetic switch for controlling the electronic functions of an appliance on the Jewish Sabbath is disclosed herein. A housing with an integrated magnetic slider is permanently attached to the appliance surface directly adjacent to and above its embedded magnetic sensor, whereupon the magnetic force of the extended slider opens the sensor's electrical circuit and disables various auxiliary electronic functions whose operation is prohibited on the Sabbath. The slider is pushed back inside the housing after the Sabbath ends, allowing the sensor's electrical circuit to return to its regularly closed position, enabling the appliance's electronic functions for normal weekday operation. A timer alarm switch mounted within the housing provides an audible reminder to manually activate the magnetic switch each week before the Sabbath begins, or alternatively, to automatically extract the slider from the housing before the Sabbath commences, and retract the slider into the housing after the Sabbath concludes.