Abstract: A sliding switch for manually controlling a socket-plug timer which is protected so as to be at least splash-proof to water, including a housing constituted of at least two parts, which is sealed through the intermediary of a sealing strip squeezed in between the joining locations of the housing parts. One of the housing parts is provided in the region of the joining parts with an access or through-opening which is open towards the sealing strip for a preferably round actuating pusher of the sliding switch, and in which the sealing strip includes a ring-shaped formation in the region of the access opening, through which the actuating pusher is sealed with respect to the access opening.