MINIR4 is a mini WiFi smart switch powered by an ESP32 dualcore WiFi chip that converts traditional wall switches into smart switches for lights and electronic devices. Its compact size fits into small mounting boxes, including EUtype, 86type, and 120type boxes, making it ideal for retrofit installs where space is limited. Key benefits Compact retrofit design: 40 percent smaller than the previous generation, fits into tight mounting boxes and behind existing switch plates. Powerful and responsive: ESP32 dualcore processor delivers stable, lowlatency wireless performance for reliable smart control. Broad switch and sensor compatibility: Works with momentary switches, doorexit switches, SPDT switches, latching switches, and dry contact sensors. Detached relay mode: Separates the physical external switch state from the relay state so pressing the wall button does not force the relay off. This keeps the device available for app control even after using the physical switch. Local remote gateway: Acts as a local gateway for compatible remote controllers and companion devices using the product remote signal, enabling local control and scene triggers without cloud dependency. Delay poweron state: Set appliances to stagger their restart after a power outage to prevent inrush currents and reduce stress on connected devices. Smart scene integration: Works with motion sensors, door and window sensors, and other smart devices to automate lighting and routines. How it solves common problems No more oversized modules: Tiny footprint allows smart upgrade in rooms with shallow or crowded switch boxes. Keeps smart control available: Detached relay mode avoids accidental loss of app or automation control when a physical switch is used. Reduces surge risk after outages: Staggered poweron prevents all devices from switching on at once and lowers the chance of tripping breakers or damaging equipment. Flexible wiring and use cases: Accepts many types of external switches and dry contacts, so it fits varied wiring setups and sensor inputs. Practical use scenarios Retrofit a bedroom or hallway: Install behind the existing wall plate to add app control, voice routines, and motiontriggered lighting without changing the switch style. Stairwell or corridor automation: Pair with motion sensors to turn lights on only when needed and use the delay poweron setting to protect lighting circuits after power restore. Garage door area or workshop: Connect a doorexit or dry contact sensor to trigger lights and other devices when a door opens, while keeping manual switch operation independent of automation. Technical highlights Model: MINIR4 Communication: WiFi via ESP32 dualcore chip Compatibility: Momentary, SPDT, latching switches, doorexit switches, dry contact sensors Size: Small form factor suitable for EUtype, 86type, 120type mounting boxes Control options: App control, physical switch input, local remote control and scene triggers Special features: Detached relay mode, delay poweron state, local gateway capability for compatible remotes and companion devices MINIR4 provides a compact, flexible, and reliable way to convert conventional switches into smart switches while preserving manual operation and adding advanced automation.