Shelly i4 Gen3 is a Wi-Fi input module that turns up to four wired buttons or switches into scene and automation triggers without controlling a load itself.
Setup guides
Roles it can fill
Reads four switch or button inputs and reports short, long, and multi-press events, so existing wall switches become scene controllers. It switches no load of its own. The native Shelly integration gives local control with no cloud required, plus Bluetooth and MQTT support.