| CPC G06Q 20/3278 (2013.01) [G06F 8/65 (2013.01); G06F 21/44 (2013.01); G06K 7/0013 (2013.01); G06K 19/042 (2013.01); G06K 19/07749 (2013.01)] | 20 Claims |

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1. A card for communicating with a front-end device, the card comprising:
a substrate;
an audio generator at least partially embedded in the substrate and configured to generate audio waves;
a contact at least partially embedded in the substrate and configured to activate the audio generator; and
circuitry configured to process an incoming signal from the contact and to transmit an outgoing signal to the audio generator,
wherein the circuitry is further configured to be reprogrammed, through the contact and via a contact pad of another device, with a new threshold value of a current or a voltage across the contact,
wherein the circuitry is further configured to generate, based on the new threshold value being satisfied, code that is executable by the circuitry to generate the outgoing signal, and
wherein the audio generator generates a sequence of tones based on the outgoing signal.
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