ISO/IEC 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.