A device for holding credit cards, bank cards, charge cards, or any similar type of card is disclosed having a compartment for holding the card, switching elements which are activated by the card, and a warning device that is activated by the switching elements. The holding device also performs calculation via a keypad, a display, a memory, an arithmetic and/or logic processor for keeping track of the financial transactions regarding the use of the card such that before the card is reinserted into the holding device, the warning device alerts the user to update the memory with the latest financial transactions for the card.

An apparatus for organizing data associated with each of a plurality of cards comprising a microcontroller, memory for storing said data associated with each said card, selecting means for selecting data from said memory associated with each said card, input means wherein said input means communicates with said microcontroller to store data to said memory for each said card and track changes to said data for each said card, in a first operable position when each said card is in a retracted position respectively.

A portable transaction cost tracking device, whereby the user is able to define the transaction to be tracked. The transaction is defined by means of a description, a tracking code and cost data that has been incurred by the said transaction at a given date and time. The system provides the capabilities to enter, edit, recall and delete information required to track any user transaction. The device interacts with the user by means of system function keys on a keypad and system generated prompts by means of menus on the device's display unit. Transaction budget control is also built into the device and can be applied to any user defined transaction. The device is able to communicate electronically with an external computer in order to bi-directionally exchange transaction data.

A pocket secretary which includes a calculator and booklet integrally connected to it. The calculator forms the front cover of the booklet and the booklet is closed by a back cover to form a slim, compact and portable pocket secretary.

An electronic card reading device for reading the data stored in an electronic card by electrically bringing the electronic card into contact with the reading device and for displaying the data that is read on a display thereof comprising; a main unit in the form of a thin plate having card contacts which are electrically brought into contact with an electronic card, an integrated circuit, and a display on which to display the data which is read from the electronic card, a power source in the form of a thin plate which is electrically connected to the main unit to supply power thereto, the power source being constructed so as to be separate from the main unit, and a soft cover having a housing portion for the main unit and another housing portion for the power source, in which the main unit and the power source are separately housed, and having an electronic card pocket which is so disposed that an electronic card can be inserted therein and the electronic card thus inserted is brought into contact with the card contacts of the main unit which is housed in the main unit housing portion.