Abstract: A security alarm system for a building includes rechargeable battery-operated alarm circuitry, with the system including a burglar alarm in conjunction with an entrance door. Inside switches selectively activate the system and operate an electric motor to slide a door bolt between open and closed positions. With the door bolt closed, anyone attempting to retract the door latch closes a latch-operated switch in the alarm circuit, setting off the alarm. Magnetic switches embedded within the outside wall of the building at secret locations are operable from outside the building by touching the proper pole of a magnet to the proper secret spot on the wall to close the bolt and activate the system or open the bolt and deactivate the system to permit authorized entry from outside. The system also includes heat-sensing switch means in the alarm circuit for sounding the alarm in the event of fire, smoke or heat without the necessity of activating the magnetic or inside switches.