Shelly Plus 1

The Shelly Plus 1 is a miniature Wi-Fi relay from Shelly (Allterco Robotics) that installs behind an existing wall switch or inside a junction box, making ordinary lights, fans, gates, and garage doors smart without replacing any visible hardware. At roughly 42 by 36 by 17 millimeters it fits in standard wall boxes, its dry-contact relay switches up to 16 amps, and it accepts a wide range of supply voltages — 110 to 240 volts AC as well as low-voltage DC — which makes it useful well beyond lighting.

It earns its buy-it-for-life listing because Shelly does local control properly. The device hosts its own web interface, exposes a documented HTTP RPC and WebSocket API, and speaks MQTT natively. No account or cloud connection is ever required; the Shelly Cloud app exists but is strictly optional. Just as important, the wall switch keeps working as a plain switch even if the smart features are never touched — your house never depends on the network being up.

Longevity Verdict

Relays are the classic wear item in any smart switch, and the Plus 1's 16-amp rating provides sensible headroom for typical residential loads. The ESP32 platform inside is one of the most widely used microcontrollers in existence, with mature and stable firmware. Shelly has a solid record of shipping firmware updates to older product generations for years, and the on-device mJS scripting engine means automations can run entirely on the relay itself, with no hub at all. Because all behavior is exposed over open protocols, the device remains fully usable with Home Assistant, Node-RED, or plain scripts even if Shelly's app and cloud disappear. One buying note: Shelly's lineup has since moved on to Gen3 and Gen4 hardware, and the Plus 1 is a Gen2 device — still supported and widely available, but worth price-checking against its direct successors.

Failure Modes & Repairability

Realistic failures are relay contact wear under heavy or inductive loads, heat stress from crowded boxes when running near maximum rating, and occasional power-section damage after surges. None of these are practically user-repairable — this is a compact sealed device, and at its price point replacement is the rational repair. The buy-it-for-life argument is therefore about the system rather than the individual unit: wiring is simple to document, replacements are cheap and wiring-compatible, and a swap never requires re-architecting your automations because nothing is locked to a serial number or a cloud identity. Derate sensibly — keep sustained loads comfortably below the 16-amp maximum — and these modules routinely run untouched for many years.

Warranty & Support

Shelly's formal warranty varies by sales channel: EU consumers get two-year statutory protection, while purchases through US distributors typically carry a shorter manufacturer warranty, so check the reseller's stated terms. Support in practice is strong — Shelly publishes complete API documentation, maintains an active firmware release cadence across device generations, and has one of the larger user communities in the DIY smart home space. A standing safety note rather than a warranty note: this device wires into mains electricity, and installation should be done with the circuit de-energized and, where local code requires it, by a qualified electrician. Installed correctly and loaded sensibly, the Plus 1 is about as future-proof as a Wi-Fi relay gets.