| 摘要 |
<p>The present invention called "Portable device for electronic payments" or "Electronic wallet calculator for cashless transactions" refers to a combined system of conversion, calculation and transmission of processed data for immediate and presencial payments and revenues, through portable or fixed devices of close but contactless communication, which, in most models, is similar to a wallet calculator or a mobile phone, in which the basic functions of arithmetic operations designed to be subtraction (debit) or addition (credit) are only performed, whenever two similar or compatible devices establish a link of connectivity and synchronization of the processed, encoded and encrypted data between themselves, in a secure and off-line way, using infrared, radio frequency of short distance, or other forms of "contactless" transmission.</p> |
