Difference between E16v2 & E16s

[dharma]

I know that E16 doesn't have NC connections and also the buttons are plastic, where as E16 v2 has both NO and NC connections and with metal buttons.  But, what are all the differences between E16 v2 and E16S?

TIA.

[admin]

E16S have ESP32 chip, it's not only a extend relay module. it's a system.