Abstract: The inventive device functions to warn a user of the undesirable condition of an appliance or other equipment. An “undesirable condition” may be an automatic garage door that is left open, a toaster oven or electric heater that is left on, an air conditioner that is left on, a security alarm that is left de-activated, or any other condition which is deemed undesirable and would benefit from a warning device which allows a user to return to the location of the appliance and remedy its undesirable condition. The inventive device is comprised of a base unit system that is in monitoring contact with the appliance of interest through at least one sensor, and a remote receiving unit system which travels in the user's automobile. The base unit communicates status information regarding the appliance to the receiving unit and the receiving unit can determine whether the status of the appliance is undesirable.