However, the main annoyance this product shows is that due to the built in microphone, a loudspeaker, a battery and a voice-recognition chip and though the credit card is of a acceptable size, it is approximately three times thicker than a regular one and a lot heavier. This may be a categorically drawback and designers are working on enhancing this.
The Technology
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The voice card was designed specifically to prohibit fraud of online transactions. The first voice card has no microphone, instead it has a built-in speaker that gives emits an acoustic Id signal which is received by a computer's microphone and sent to an online server for processing.
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