Abstract: There is provided an alarm clock of the type which produces an electric signal and which operates in conjunction with an auxiliary device. The clock comprises first circuit means having first switch means for producing and cancelling the signal, and second circuit means having second switch means for switching the auxiliary device on and off. A single spring contact forms a common switch member of said first and second switch means. The advantage gained hereby is that the number of switches normally required to produce and cancel said signal and to energize and de-energize said auxiliary device is reduced.