Shelly 1PM Gen4

The Shelly 1PM Gen4 is a behind-the-switch 16A relay with power metering that speaks Wi-Fi 6, Zigbee 3.0, Bluetooth and Matter. It makes an existing light or circuit smart without replacing the wall switch, and it is the default recommendation in Home Assistant and Homey communities. The one thing to know: it goes inside the wall box, which in most jurisdictions means an electrician.

Who is the Shelly 1PM Gen4 for?

• Priced at about $32.99 for the UL-certified US version and €21.90 in the EU per the listing's pricing line.
• Power metering per circuit is useful for tracking a shop's lighting or equipment consumption.
• Gen4 added Zigbee and Matter to the Wi-Fi relay, so it fits any hub.
• Needs a neutral wire in the box.

For non-technical buyers, the Tapo P125M plug is the no-tools alternative. Browse home automation.

Who should skip it

Anyone who cannot or should not open a wall box. Renters and anyone without a neutral wire should use a smart plug or smart bulb instead.

Research-based listing — not hands-on tested by Digital4All; details as of September 2026.