Abstract: A solid state, portable, self-contained security system for indicating unlawful entry and/or loss of valuable articles includes circuitry having current flow control means normally in an "off" state and set to be rendered in an "on" state when security has been broken, whereupon an alarm is provided. The alarm continues until the current flow control means is reset. The circuitry operates in a sensorless mode whereby the alarm is provided when the external connections to the circuit are disturbed, and in a sensor mode whereby the actuation of external sensors connected to the circuitry provides the alarm.