DS-7604NI-K1/4P is an improved version of DS-7604NI-E1/4P/A with various improvements
Read much more about it - and everything else on the product page for the new version: DS-7604NI-K1/4P
We have kept the product page for the DS-7604NI-E1/4P/A so that you always have easy access to the documentation.