Voice recognition credit card

The Beepcard is a unique credit card prototype as it comes with a paper-thin speaker, microphone, and voice recognition chip embedded within. Before using this card, you’ll need to speak into the card – should a match occur, the card will send “high frequency, hard-to-fake beeps over the phone or a computer microphone, signaling the credit card company to authorize the transaction”. I wonder what happens if someone records your own voice without your knowledge in order to use the Beepcard. The Beepcard is currently market ready and are on the lookout for partners to roll it out on a mass scale.