A security system for displaying and protecting a single displayed product comprising: an individual display module adapted to be mounted on a support; a sensor removably seated on the individual display module and connected to the single displayed product; a remote source of electric power; a first power cord electrically connecting the individual display module to the source of electric power; a second power cord electrically and mechanically connecting the individual display module to the sensor; a third power cord electrically and mechanically connecting the sensor to the single displayed product, wherein said first, second and third power cords (59, 77, 89) provide an electrical path extending from the remote source of electric power through the individual display module to the single displayed product and wherein an alarm circuit is contained in the individual display module and provides a sense loop through the second power cord and an audible alarm for sounding an alarm upon the integrity of said second power cord being compromised; characterized in that: the alarm circuit further provides a sense loop through the third power cord and the audible alarm sounds an alarm upon the integrity of said third power cord being compromised; the sensor includes an internal plunger switch or pressure switch configured to activate the alarm system when sensor is secured to the single displayed product; and a further plunger switch or pressure switch is mounted within the individual display module and configured to activate the alarm system when the individual display module is mounted on the support, wherein the alarm circuit is configured to sound an alarm upon removal of the single displayed product from the sensor or upon removal of the individual display module from the support, namely upon actuation of the internal plunger switch or pressure switch or upon actuation of the further plunger switch or pressure switch. an individual display module adapted to be mounted on a support; a sensor removably seated on the individual display module and connected to the single displayed product; a remote source of electric power; a first power cord electrically connecting the individual display module to the source of electric power; a second power cord electrically and mechanically connecting the individual display module to the sensor; a third power cord electrically and mechanically connecting the sensor to the single displayed product, wherein said first, second and third power cords (59, 77, 89) provide an electrical path extending from the remote source of electric power through the individual display module to the single displayed product and wherein an alarm circuit is contained in the individual display module and provides a sense loop through the second power cord and an audible alarm for sounding an alarm upon the integrity of said second power cord being compromised; characterized in that: the alarm circuit further provides a sense loop through the third power cord and the audible alarm sounds an alarm upon the integrity of said third power cord being compromised; the sensor includes an internal plunger switch or pressure switch configured to activate the alarm system when sensor is secured to the single displayed product; and a further plunger switch or pressure switch is mounted within the individual display module and configured to activate the alarm system when the individual display module is mounted on the support, the alarm circuit further provides a sense loop through the third power cord and the audible alarm sounds an alarm upon the integrity of said third power cord being compromised; the sensor includes an internal plunger switch or pressure switch configured to activate the alarm system when sensor is secured to the single displayed product; and a further plunger switch or pressure switch is mounted within the individual display module and configured to activate the alarm system when the individual display module is mounted on the support, wherein the alarm circuit is configured to sound an alarm upon removal of the single displayed product from the sensor or upon removal of the individual display module from the support, namely upon actuation of the internal plunger switch or pressure switch or upon actuation of the further plunger switch or pressure switch.