Lost credit cards could be a thing of the past thanks to a device which beeps when your plastic leaves your wallet. The 'card beeper' descreetly sounds every 20 seconds when no card is in it. The noise is low enough not to attract unnecessary attention in a bar or in the street, but is sufficent to ensure you are aware you left the card behind.

Shame they haven't made a beeper that lets you know when a card has left your partners wallet.... that really would be an instant sellout.