Abstract: A customer information input system for a P.O.S. terminal includes a portable type wireless input device that has a magnetic card reader section a key entry section for inputting customer data, for reading information from the card, a memory section for storing the information and the data, a transmitting section for sending the information and the data in response to a request signal, and a repeater connected to the P.O.S. terminal for transferring the information and the data to the P.O.S. terminal. A plurality of such input devices are placed at various sales counters and customers can simultaneously input the information and the data for transmission to the terminal which receives and processes the transaction.