Abstract: A mobile security system includes remote sensor units each having a condition-responsive sensor of a variety of types (motion, intrusion, loop, heat, water, etc.) and a transmitter for sending a signal to a master control to report a sensed condition. The master control includes a receiver for intercepting signals from the remote sensors and a transmitter for sending a signal to a remote alarm unit in response to a sensed condition. The remote alarm unit can be positioned to provide a sound to discourage an intruder or it can be positioned to alert a guard that an intruder or other condition has been sensed. One of the remote sensors is disposed in a pocket on the bottom side of a tarp which is used to cover goods to protect them from weather and theft. Any attempt to loosen or move the tarp to gain access to the goods will cause an alarm signal to be generated.

Abstract: An alarm switch for indicating when a latch or dead bolt for a door or window is locked or unlocked comprises a switch casing adapted for mounting on the exterior portion of the door or window frame or door or window; an electrical contact assembly mounted in the casing; a contact assembly actuating member mounted in the casing in position to change the electrical state of the contact assembly by movement of the actuating member from a deactuated to an actuated position, the actuating member being resiliently biased toward its deactuated position but being in position to engage the dead bolt or latch and move to its actuated position when the door or window is shut and the dead bolt or latch is locked, the actuating member being accessible to the door or window latch or dead bolt through an opening in the casing; and electrical terminals on the contact assembly adapted to be connected to leads leading to a remote alarm system that indicates to the alarm circuit when the door or window bolt or latch is opened.