Sonoff MINI ONE (Matter over WiFi) Review: The 16A Matter Relay for a Plain Wired Switch
The Sonoff MINI ONE (Matter over WiFi) is a concealed 16A relay that retrofits an ordinary wired switch into a Matter accessory without changing how the wall plate looks. It is the plain switching model of Sonoff's MINI ONE line: it carries the same 16A / 3840W resistive rating and the same compact body as the metering sibling, but it does not measure power, so it is the pick for anyone who wants Matter control and does not need per-circuit energy data. Setup needs a neutral wire, it switches the live wire only, and it is 2.4GHz Wi-Fi with no Zigbee or Thread, which keeps it a budget, single-purpose module rather than a system hub.
- Retrofitting existing wall switches
- Matter-first homes
- Local-control and Home Assistant setups
- Budget buyers
Pros
- Matter over 2.4GHz Wi-Fi brings it into Alexa, Google Home, Apple Home, SmartThings and Home Assistant without a hub
- Local web console on the LAN, plus open HTTP (JSON-RPC 2.0), WebSocket and MQTT interfaces for Home Assistant, OpenHAB and others
- Detach Relay mode lets the wired wall switch trigger scenes instead of the load
- Configurable power-on state (ON, OFF or keep) after an outage
- 16A rating with a 3840W resistive maximum, from a module small enough for a standard wall box
- Built-in overheat protection cuts power at excessive temperatures
- Physical button on the module for manual control and pairing
- Smart timers and scenes in the eWeLink app
- Two-year warranty
Cons
- Requires a neutral wire, so it will not fit older two-wire switch boxes
- Switches the live wire only, with no dry contact for low-voltage or potential-free circuits
- Single channel, so no interlock for a two-direction motor
- No energy monitoring or power metering on this model
- 2.4GHz Wi-Fi only, with no 5GHz band
- No Zigbee, Thread, Z-Wave or RF radio, so it cannot extend a mesh
- Mounts inside an electrical box, not on a DIN rail
- Sonoff publishes the 16A figure as a resistive maximum, with no separate inductive or capacitive ratings
- Standby power consumption is not published
Who is the Sonoff MINI ONE (Matter over WiFi) for?
This is a concealed relay module, not a switch you look at: at 39.5 x 33 x 16.8 mm and 27.5g it is built to sit inside the electrical box behind an existing wall switch, so the plate and the mechanical switch stay where they are and the circuit keeps working by hand. The S1 terminal reads that wired switch, and the relay adds app, voice and automation control on top. With a single channel rated 16A at 100-240V, it fits a lighting circuit or a single household appliance, and Sonoff positions it for heavier everyday loads such as storage water heaters, ceiling fans and electric underfloor heating. It is the right shape for anyone in a Matter household who wants an existing switch to appear in Alexa, Google Home, Apple Home, SmartThings or Home Assistant, and it needs a neutral wire in the box.
What stands out on paper
The headline is Matter over 2.4GHz Wi-Fi: no vendor hub is required, and the module commissions straight into a Matter fabric, which is what carries it into Alexa, Google Home, Apple Home, SmartThings and Home Assistant at once. Around that, the practical extras matter for a retrofit. Local control is a real path rather than a workaround, with a browser console on the local network plus open HTTP (JSON-RPC 2.0), WebSocket and MQTT interfaces that Home Assistant, OpenHAB and other platforms can drive, and Home Assistant is also documented through MQTT Discovery. Detach Relay mode frees the wired switch to trigger scenes instead of the load, the power-on state can be chosen (ON, OFF or keep) so the circuit comes back the way you want after an outage, and there is a physical button on the module. Sonoff rates the contact at 16A and 3840W for a resistive load, and the module carries built-in overheat protection that cuts power when temperatures climb. The 2-year warranty is standard for the brand.
What to know before you buy
The neutral wire is the hard requirement and the first thing to check in the box before ordering. The output is a switched live wire on the two L Out terminals, which are internally connected and do not add a second channel, so this is not a dry-contact module: a potential-free contact for a boiler, a gate controller or any low-voltage circuit needs a different device. It is a single channel, so there is no interlock behaviour for a two-direction motor, and it mounts inside an electrical box rather than on a DIN rail. On the radio side it is 2.4GHz Wi-Fi only, with no 5GHz, Zigbee, Thread, Z-Wave or RF, so it joins a network as a leaf and never extends a mesh. This plain model does not measure energy: if you want per-circuit consumption or bidirectional metering, that is the MINI-1GSP sibling, not this one. Sonoff publishes the 16A figure as a maximum resistive load and does not publish separate inductive or capacitive ratings, so a motor, transformer or heavily capacitive load should be sized conservatively, and standby consumption is not published either.
Is the Sonoff MINI ONE (Matter over WiFi) worth it?
At the budget tier, the module is dense for its size and price: 16A switching, Matter over Wi-Fi, four major ecosystems without a hub, a local web console, three open API transports and a physical button, all inside a body that fits a standard round wall box. The comparison it invites is against its own power-metering sibling and against plain 16A smart relays. It separates itself from the latter by speaking Matter natively and exposing local control, and it sits below the metering sibling on purpose: if you do not need the metering and the year of on-device energy history, dropping to the non-metering model is the cheaper way into the MINI ONE line. It is not the right pick when the job needs a dry contact, two channels, a DIN rail, a circuit without a neutral, or energy measurement.
Frequently asked questions
Does the Sonoff MINI ONE (Matter over WiFi) need a neutral wire?
Yes. Sonoff's own product FAQ states the MINI-1GS requires a neutral wire for installation, and the module has dedicated N, L, L Out and S1 terminals. A switch box wired with only a live loop will not work.
Does the Sonoff MINI ONE (Matter over WiFi) need a hub?
No. It connects over 2.4GHz Wi-Fi and joins a Matter fabric directly, so it works with Alexa, Google Home, Apple Home, SmartThings and Home Assistant without a Sonoff bridge. A Matter controller such as a HomePod, an Apple TV, a Google or Echo speaker, a SmartThings hub or a Home Assistant install acts as the controller you already have.
Does this model monitor energy use?
No. This MINI-1GS is the plain switching model: Sonoff publishes switching, schedules and local control but no voltage, current or power metering and no energy history. If you need per-circuit measurement, the power-metering sibling MINI-1GSP is the one to pick.
What can the Sonoff MINI ONE (Matter over WiFi) switch?
It is rated 16A at 100-240V, 50/60Hz, with a 3840W maximum resistive load. Sonoff lists lighting circuits, ceiling fans, storage water heaters and electric underfloor heating, and does not publish separate inductive or capacitive ratings, so motors, transformers and LED drivers should be sized conservatively. The installation instructions call for a 16A MCB or RCBO upstream of the module.
Can it be controlled without the cloud?
Yes. It exposes a browser console on the local network and open HTTP (JSON-RPC 2.0), WebSocket and MQTT interfaces that Home Assistant, OpenHAB and other platforms can drive directly, and Home Assistant can also discover it over MQTT. Matter control is local as well.
How many channels does it have and can it do a dry contact?
One channel. The two L Out terminals are internally connected to the same switched live output and do not add a second channel, so the contact is not potential-free. A boiler, gate controller or other low-voltage circuit needs a dry-contact module instead.
