Sonoff Mini R4 is a compact in-wall dual-control smart switch with Matter support and exposed serial pads for DIY flashing. It offers live/neutral in‑out terminals and two switch ports for multi-load control, making it a good budget pick for smart-home hobbyists — but lacks an official DIY/Local-flash mode and requires opening the case to install custom firmware.
For DIY-savvy smart-home users who want Matter/voice integration and are comfortable opening and soldering; avoid if you require official local-flash support or zero-risk disassembly.
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