Abstract: A self-contained intelligent point of sale device for the collection of sales data on presentation of a valid identification card, the device comprising a microprocessor having a memory and a buffer, a keyboard for entering information concerning one or more transactions into the buffer, a recording unit interfaced with the microprocessor and a reader interfaced with the microprocessor for reading and checking the identification card against the memory whereby when the memory recognizes a valid identification card, the information concerning the transaction or transactions entered into the buffer is transferred to and recorded in the recording unit together with particulars from the identification card.