The Emue Technologies credit card has an embedded display, a 12-button numeric keypad and a microprocessor. The embedded battery should last for at three years. The idea is that when users want to authenticate a phone or online transaction, the enter the transaction info on the keypad (and also their PIN code), and the card generates a one-time authentication code.
The company also has an Authentication application for J2ME phones and the iPhone.
VISA are currently testing Emue's embedded authentication technology.