A reminder device includes a frame-shaped base defining an opening and configured to be mounted over and around an operational button/handle located in a vehicle or in a home; a lid coupled to the frame-shaped base and configured to close over said frame-shaped base, covering said opening and blocking access to said operational button/handle; a circuit configured to product an audible message upon receiving a trigger signal, said circuit being located in at least one of said framed-shaped base and said lid; and a switch including a first component located on said frame-shaped base and a second component located on said lid and so configured that when said first component and second component are separated from each other by a predetermined distance, when the lid is opened, the switch causes the creation of said trigger signal and the production of said audible alarm.