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What You'll Need
- Sonoff Mini R4 WiFi Smart Switch
- Screwdriver
- Wire strippers
- Voltage tester
- Smartphone with eWeLink app
- 2.4GHz WiFi network
Step-by-Step Setup
- Turn off power: Switch off circuit breaker for the circuit.
- Access wall box: Remove existing switch or outlet cover.
- Wire the Mini R4: Connect Live (L), Neutral (N), and Output (L Out) wires. Connect external switch wires to S1 and S2 if using.
- Position relay: Fit the Mini R4 behind your existing switch or in the junction box.
- Reinstall switch: Put the original switch back if desired for manual control.
- Restore power: Turn breaker back on.
- Download eWeLink app: Install and sign in.
- Enter pairing mode: Press the button on Mini R4 for 5 seconds until LED flashes.
- Add device: Follow app prompts to connect to WiFi.
Key Features
- Compact design fits behind existing switches
- Works with or without neutral wire (Neutral recommended)
- Matter compatible via firmware update
- Supports external momentary or toggle switches
- 10A relay capacity
- Detached relay mode for smart bulb control
- Works with Alexa, Google, HomeKit (via Matter)
- Local control without cloud available
Troubleshooting
- External switch not working: Check S1/S2 wiring. Configure switch type in app (momentary vs toggle).
- Won't connect: Ensure 2.4GHz WiFi. Reset by holding button 5+ seconds.
- Smart bulb mode: Enable "Detach Relay" in app settings to keep power on for smart bulbs.
- Fitting issues: Mini R4 is compact but verify wall box has space before purchasing.