US Patent 10360416 Card reader anti-theft devices and methods

A detection device and method includes a tongue component having a distal end portion that is insertable a predetermined distance into a card entry slot of a card reader and also having an electrical contact disposed on the distal end portion of the tongue component. A signal component coupled to the electrical contact is activated in response to receiving an electric current by the signal component via the electrical contact disposed on said distal end portion of the tongue component when the distal end portion of the tongue component is inserted the predetermined distance into the card entry slot. An overlay component having portions defining a surface topography corresponding to a surface topography of portions of a bezel area of the card entry slot supports a proximal end portion of the tongue component.