The Sonoff Mini R4 (model MINIR4, also called Mini Extreme) is a Wi-Fi switch module so small that it fits in the tightest wall boxes. In this guide I explain what it is, its official specifications, what sets it apart from other Mini models, how it integrates and how it differs from the Mini R4M with Matter.
Sonoff Mini R4 at a glance
| Feature | Data |
|---|---|
| Input and output voltage | 100-240 V ~ 50/60 Hz |
| Maximum load | 10 A, up to 2,400 W |
| Connectivity | Wi-Fi 2.4 GHz (802.11 b/g/n) and Bluetooth LE |
| Chip | ESP32 |
| Dimensions | 39.5 x 33 x 16.8 mm (40% smaller than the Mini R2, according to Sonoff) |
| Working temperature | -10 °C to 40 °C, humidity 5-95% non-condensing |
| Detach relay | Yes |
| Supported external switches | Momentary, SPDT (two-way), latching, door exit and dry contact |
| Control | eWeLink app, voice (Alexa and Google Assistant), scenes, timers, groups, inching mode and LAN control |
| Certifications | CE, FCC and TÜV |
What is the Sonoff Mini R4 and what is it for?
It is a smart relay installed behind an existing switch or push button. It lets you turn a light or other load on and off from your phone, schedule it, add it to scenes or control it by voice, without replacing the wall switch. Its small size is its main advantage: it fits in narrow wall boxes where other modules do not.
What sets it apart: detach relay and power-on state
- Detach relay: the state of the external switch and the state of the relay are separated. You can operate the wall switch without changing the relay state, and the module stays online for app control.
- State after a power cut: you can configure the power-on state for when the power comes back.
- Several external switch types: the same module works with push buttons, two-way switches or dry contacts.
Sonoff Mini R4 or Mini R4M (Matter)
The MINIR4M is the Matter-certified version: it works with Apple Home, Alexa, Google Home and SmartThings, and can be added through Matter or from the eWeLink app. It keeps the same dimensions, voltage and maximum load, and according to Sonoff it requires a neutral wire. If you already use a Matter ecosystem, the R4M is the logical choice; if you only work with eWeLink, Alexa or Google, the R4 covers the same ground. Read the R4M review in Sonoff Mini R4M: Matter arrives.
How to install it
- Cut the power at the board before touching anything.
- Connect live, neutral (if your wiring requires it), the load and the external switch following the Sonoff manual diagram.
- Mount the module in the wall box and restore the power.
- Add the device in the eWeLink app and test it.
The module is not waterproof and must not be used outdoors or in damp areas without protection. If you have no experience with electrical installations, hire a qualified installer.
Integrations
- eWeLink: the official app, with remote control, timers and scenes.
- Alexa and Google Assistant: voice control.
- LAN control: the datasheet lists a LAN mode for local network control.
- ESPHome: it uses an ESP32, so it can be flashed with ESPHome, although the documented method is through the serial port and requires soldering. If you do it, you lose the original firmware and the eWeLink app.
Where to buy
The best way to get one is the official ITEAD store, which offers support and warranty. As a member of the AutomatismosMundo community you also get an extra 10% off with this coupon: AXLMSONOFF.
Frequently asked questions
How much load can the Sonoff Mini R4 handle? Up to 10 A, with a maximum of 2,400 W. For motors and other inductive loads, stay below the rated power.
Is it compatible with Alexa and Google Home? Yes, it works with Alexa and Google Assistant through eWeLink. For Apple Home you need the Matter model (R4M).
Can it work without internet? It has LAN control according to its datasheet. Remote control from outside your home does require the eWeLink cloud.
Is it waterproof? No. It is not suitable for outdoor or damp areas without protection.
What is the difference between the Mini R4 and the R4M? The R4M adds Matter certification and, according to Sonoff, requires a neutral wire.
Technical data: official Sonoff datasheets for the MINIR4 and MINIR4M models.
Related guides: How to set up the Sonoff Mini R4, Mini R4 vs R4M vs ZBMINIR2 vs Mini R2 and Sonoff hubs and gateways.
