Banking cards are widely used for performing various financial transactions. The usage of cards is considered to be convenient and safe over transactions by cash payments. There are several types of cards available today and among them, the debit and credit cards are the most commonly used. Debit cards are provided by the banks to the account holders in order access the accounts electronically. A credit card is a payment card issued to the users as a system of payment. Every credit card holder

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... ets a revolving account with the card issuing bank and granted with a line of credit. Most of the banks offer both credit cards and debit cards. Due to the benefits of debit and credit cards, a normal customer would prefer to have both the cards and selectively use either of the cards for a transaction. Even though it is beneficial to have both the cards, carrying two separate cards everywhere is regarded as inconvenient and unsafe. So the objective our work is to devise a model to integrate two card functionalities into one card and let the user choose the mode of the card. In our model, the user may change the card mode using the keypad provided at the backside/front of the card. A four digit security pin has to be entered for that. User could see the present mode of the card on a small LCD screen available in the card. When the card mode is set to 'lock', the card gets blocked and any attempt to use the card will be declined. Unlocking could be done by restoring the mode to debit or credit. The proposed model of the card incorporates a Processor, ROM, NVRAM, LCD screen and a keypad. The whole circuit will be powered by battery. Finally a review of the model is done and the benefits, limitations and future research possibilities as identified.