Abstract: A wedge-shaped device for use as an alarm for detecting the unauthorized opening of a hinged, inwardly-opening door may be easily installed at the base of the door to resist forced opening of the door while simultaneously sounding a highly audible alarm signal indicative of an attempt to break in. The device uses a top chassis mounted on a bottom chassis to initiate the alarm whenever the top chassis is forced downwardly onto the bottom chassis, and the alarm will continue to sound until the device is reset. The device maintains its wedge shape even after the top chassis is forced down onto the bottom chassis, thereby effectively preventing the door from opening inwardly until the device is removed from its position at the base of the door.

Abstract: A device for use as an alarm for detecting the unauthorized opening of a sliding door or window is disclosed which is a wireless electronic alarm device which may be easily installed either horizontally or vertically in the casing of a sliding door or window to resist forced opening of the sliding door or window while simultaneously sounding a highly audible alarm signal indicative of an attempt to break in. The alarm device is of lightweight, portable construction in a tubular design which acts to substantially forestall the opening of the sliding door or window without the application of force sufficient to break the door or window. Once triggered, the alarm will continue until the unobtrusive owner-activated reset switch is activated to disarm the device.