Access controlled system with acoustic mechanical verification transmitter

An identification device configured for use in an access-controlled system, the access-controlled system including a control unit configured for reading information encoded by the identification device and for allowing a user to access the access-controlled system upon an establishing of an identity of the identification device, the identification device comprising a signal generator device configured for generating a reproducible acoustic signal in a mechanical manner when acted upon by the user, the reproducible acoustic signal including a clacking noise, a frequency spectrum of the clacking noise encoding an information, the signal generator device including at least one of a tongue, a plate, and a curved surface configured for folding upon an overcoming of an initial resistance, the folding generating the clacking noise, the respective at least one of the tongue, the plate, and the curved surface further configured for springing back to a respective original position subsequent to being acted upon.