Account balance data retrieving and displaying system and mobile device combination for use during e.g. transaction of money, has case, where actual balance value is stored in chip so that value is displayed by actuating command key of case

摘要

The combination has an integrated energy storage e.g. film battery, supplying energy to an electronic component (16) of a slender, portable card slot case (9). The energy storage is loaded via electrical contacts (14) at the case or by inductive energy transmission by insertion into a loading device. An account balance stored in a debit card or credit card (17) is reduced around a payable amount in each payment transaction. An actual balance value of a bank account is stored in a chip (19) of the debit card or credit card so that value is displayed by actuating a command key (18) of the case.