Alcance
                            ISO 17839-2:2015 defines the following:-      dimensions of a Biometric System-on-Card type S1 and type S2;-      position and size of the biometric capture device;-      minimum requirements to a Biometric System-on-Card with respect to-      mechanical durability, and?   man-machine interface and ergonomics.The standardization of other on-card devices such as an electronic display or a keypad is outside the scope of this part of ISO/IEC 17839.