If you’ve got a credit card that you’d really like to keep safe, but still tote around with you everywhere, the Card Beeper might do the trick.

It’s works on a very simple principle. It will beep every 20 seconds when there’s no card in it.

Ah … you’re asking, “and what happens when I pull the card out to pay for a purchase?”

Well, it beeps, of course. No card in it = beep. But it’s a discreet beep, so it should work out okay. The point seems to be to let you know, rather than alert the police and fire department:

“The beep is so discreet that it will not attract unnecessary attention in restaurants or on the street. But even so, it is sufficiently insistent to ensure that you are never in doubt when you have left your behind.”

Wouldn’t work well for me though. Or rather, I’d need, like ten of these babies, since I have more than one card (sad, sad, sad. I know.)

Source. Via GadgetMadness.