Abstract: A housing contains a mercury tilt switch in electrical connection with an alarm circuit and has two, relatively long, highly flexible insulated lead wires extending from the tilt switch and housing and being in electrical connection with an alarm within the circuit. The lead wires support the housing containing the switch and extend upwardly therefrom to a support affixed to a window frame or the like, and then are connected to the alarm. The lead wires are at least ten feet long, preferably about fifteen feet long, with the housing and switch being supported by the lead wires in pendulum-like fashion adjacent to, but not contacting, the window. When a disturbance such as an intruder enters the window, the pendulum-like apparatus is disturbed and the alarm is sounded.

Abstract: An electrical system is provided for attachment to basement windows or the like for the purpose of sounding an alarm automatically if the window is opened and the device is moved or tampered with. The system comprises a spring-loaded bar or a tube within a tube which is placed in the window frame without the need for screws, adhesive or other fastening means. When installed and spring-loaded, the assembly holds an electric switch in place against the side wall of the window. If the assembly is jarred or moved the switch is released, the electrical connection is either made or broken and an alarm is sounded.