Abstract: A portable unit for the input of data in a digital device, includes a control panel (1) on which is located a table (2) with a group of symbols (16) in a number of fields (13), and a base plate (3) with pressure contacts (4, 5). Two selection elements (8, 9) can be moved parallel to the rows (14) and the columns (15) of the table (2) until they are situated opposite to or above a pressure contact (4, 5) in the extension of a selected row (14) or column (15); a pressure mechanism (7) changes the position of the pressure contacts (4, 5) by means of the selection elements (8, 9) situated opposite to or under the latter; and a number of additional pressure contacts (6) which can be manually operated, whose number is equal to the maximum number of symbols (16) of a field (13) is provided.