What is the difference between ievo Revision 3 and Revision 4?

What is the difference between ievo Revision 3 and Revision 4?

The Revision 3 (REV3) Interface Board was the first biometric control board from ievo, now part of CDVI. It was launched in 2010.
The REV3 was specially designed for seamless integration into access control systems using a Wiegand connection.
ievo REV3 Revision 3 Interface Board

The ievo Revision 4 Interface Board is the next generation of the ievo product range, surpassing and building on the REV3 technology.
Improving on system integration and offering a sleek modular design, ievo REV4 equipment is fully customisable and serviceable. The REV4 can be powered by either DC or PoE, and can be paired with custom RAL coloured readers.
ievo REV4 Revision 4 Interface Board options