Shelly
1PM Gen3
Shelly 1PM Gen3 is a Wi-Fi relay module with built-in power metering that wires behind an existing switch, adding smart control and energy monitoring to a single circuit.
Setup guides
Roles it can fill
Measures real power on the switched circuit, so the same module that controls a load also reports what it draws. The native Shelly integration gives local control with no cloud required, with Bluetooth for setup and MQTT support, and a firmware update adds Matter over Wi-Fi.