An original MH-ET Live ESP32 D1 Mini with soldered male headers and programmed with a stable version of the EMS-ESP firmware (V3).
This is a drop-in replacement for the Wemos in all ESP8266 based Gateway versions like the Gateway Premium II.
This item is mainly intended for replacement purposes or if you have purchased an interface board before and now want to use it with EMS-ESP.
You can also use it as an upgrade for the ESP8266 based Gateways.
See the wiki article HERE on how to upgrade your Gateway.