A computerized method for generating a time-limited number for use in a payment card transaction involving a payment card issued by a financial institution. The data modification circuit may be configured to generate a first and second video component in response to a video data stream. The vessel is disposed around the membrane electrode assembly. The encrypted information is sent from the second site to the device, where it can then be decrypted. The controller converts internal signals to signals conforming to the standard where source voltage is 2. The demodulator, coupled to the ADC, processes the digital data to generate baseband data.