The Sonoff DW2 is a Wi‑Fi door/window contact (magnet contact sensor) that relies on eWeLink/Alexa/Google integrations and Sonoff's DIY-friendly ecosystem. Reviews of Sonoff gear praise its hackability and wide pairing with Home Assistant (support for local bridges and Zigbee coordinators) but warn that many Sonoff devices require serial flashing and can suffer firmware/boot issues; good for tinkerers and Home Assistant users, less ideal for those wanting fully local, out-of-the-box Zigbee mesh reliability.
Buy if you’re a tinker‑friendly user or Home Assistant integrator wanting easy hacking; avoid if you need a fully local, out‑of‑the‑box Zigbee mesh and zero flashing.
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