Abstract: Apparatus for providing a signal in response to the actuation of an internal lock mechanism for a door latch to a locked condition of the door latch and for detecting the locked condition when the door is in a closed position with the door latch bolt in the door jamb. Detection apparatus is located in the door jamb and senses the lock signal and in turn can provide a signal locally or to a remote security or surveillance system indicating the locked or unlocked condition of the latch bolt when the door is in the closed position.

Abstract: An alarm clock controls the supply of electrical power to a first outlet mounted on the clock housing and receiving a plug-in external electrical device to periodically change the state of the electrical device in response to an alarm time signal. A second controllable outlet is also mounted on the housing for receiving a second plug-in external electrical device. Selectible steady or pulse power is provided to the second outlet. A receiver detects power line carrier signals on the incoming electrical power lines generated by a remote device in response to the occurrence of a sound producing event or other signal. The receiver causes the clock to supply power to either or both outlets depending on the position of a function switch in response to a detected power line carrier signal. An audible sound generator provides an audible alarm tone in response to an alarm signal. Frequency and volume controls selectively vary the frequency and volume of the audible alarm tone.