Sonoff Mini R4 Extreme Matter Smart Relay
Smart Electronics
“The Sonoff Mini R4 Extreme Matter Smart Relay is an ultra-compact (30x40mm) Wi-Fi smart relay with an ESP32-C3 processor and Matter certification. While it enables deep integration in tight spaces, the locked flash prevents custom firmware without chip replacement, and its tiny pins require skilled soldering, limiting it to advanced users.”
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Extremely compact form factor fits easily behind standard wall switches.
devices.esphome.ioSwitch is really small, approx 40x33mm, easily fits behind wall switch.
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Matter certification ensures broad compatibility with major smart home ecosystems.
devices.esphome.ioSONOFFS First Matter Device
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Detachable relay simplifies replacement and repair without desoldering.
devices.esphome.ioone (detachable) relay
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Flash is locked; custom firmware requires physically replacing the ESP32-C3 chip.
devices.esphome.ioESP32-C3 flash is locked and no reflash is possible.
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Programming demands moderate soldering skills due to very small GPIO pins.
devices.esphome.iomoderate soldering skills to attach USB-RS232 converter cables.
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Protective coating on the Vcc pad must be scratched off before soldering.
devices.esphome.iopad is covered with some protecting coating - needs to be scratched, very subtly, for solder to cover it.