If you've been struggling with limited space in wall boxes to cram in two separate relays, the new Sonoff MINI-2GS (marketed as MINI DUO) is the solution we’ve been waiting for. It is a dual-channel smart switch specifically designed to turn any classic double light switch into a smart one, without occupying the full volume of standard 60mm European wall boxes.

🔍 Technical Specs: Matter Architecture and ESP32

Under the hood, we find modern hardware optimized for speed and global interoperability:

• Chipset (MCU): ESP32-C3FH4X – a latest-generation processor ensuring near-instant response times and enhanced security.

• Protocol: Wi-Fi 2.4GHz + Matter over Wi-Fi. Native Matter support means you can add it directly to Apple Home, Google Home, or Alexa, communicating locally with the rest of your devices.

• Power Rating: Supports 10A per channel, with a combined maximum total of 16A (approx. 3680W) for resistive loads.

• Dimensions: 45 x 39.4 x 16.8 mm – it is extremely thin, making it one of the most compact dual relays on the market.

🔧 Configuration and External Control (S1/S2)

The MINI-2GS is highly versatile in its interaction with wall-mounted mechanisms:

• Switch Types: Supports both classic rocker switches and momentary push buttons.

• Quick Swap: Change the configured switch type directly on the device by short-pressing the physical button 3 times.

• Wiring Warning: Terminals S1 and S2 are for the control circuit only. Connecting them to Neutral or Earth is strictly forbidden and will result in immediate device failure.

🛡️ Installation and Safety

• Neutral Wire Required: The device operates in the 110-240V~ range and absolutely requires a Neutral wire in the wall box.

• Circuit Protection: It is essential that the circuit is protected by a breaker of maximum 16A (MCB or RCBO) installed upstream of the MINI-2GS.

• Cable Gauges: Use of solid or stranded copper conductors is recommended. Terminals support standard 1.5 mm² (lighting) or 2.5 mm² cables.

• Professional Install: Because we are working with dangerous voltages, installation must be performed by a certified electrician to avoid the risk of electric shock.

🚀 Pairing and Reset

• Pairing Mode: Upon first power-up, the device enters pairing mode automatically (indicated by the blue LED flashing two short and one long).

• Manual Pairing: If the pairing window expires, re-enter this mode by long-pressing the button on the casing for 5 seconds.

• Factory Reset: For a total reset to factory settings, hold the button for 10 seconds.

✅ Verdict

The Sonoff MINI-2GS is the ideal choice for automating a double switch without any construction work. Matter support makes it compatible with almost any smart ecosystem, and the ESP32 processor provides the power needed for complex automations and stable local control.