The Sonoff S31 / S31 Lite is a 15A smart plug with energy monitoring and either Wi‑Fi (S31) or Zigbee (S31 Lite) connectivity; it supports cloud control via eWeLink but also can be reflashed to local firmware (ESP8266/ESP8285) for privacy and Home Assistant integration. Good for users who need 15A load capacity plus wattage/voltage/current metering, but expect initial flashing hurdles for local firmware and some Zigbee repeater limitations.
Buy if you need 15A-rated smart plug with energy monitoring and want the option to reflash for local control; avoid if you need plug‑slim design or plug‑and‑play Zigbee repeating.
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