A system for generating a reminder signal to one or more individuals exiting a vehicle for purposes of preventing the inadvertent leaving of a child, pet or other object therein. A sensor assembly monitors the presence of an individual within a predetermined proximity area and actuates an alarm assembly so as to generate a demonstrable reminder signal of significant intensity. A control assembly operatively connected to the sensor assembly comprises both arming and shut-off capabilities which are automatically and/or manually operable, respectively, to activate and deactivate the sensor assembly. In operation, the sensor assembly will cause the alarm assembly to generate the reminder signal upon the passage of one or more individuals out of the predetermined proximity area thereby forcing a return to the vehicle to deactivate the system, wherein the interior of the vehicle is readily observable to determine the existence of an inadvertently left object.