The Mijia/Aqara original door/window sensor is a compact Zigbee magnetic contact sensor with CR1632 coin-cell power and optional tamper detection — offering fast open/close reporting and very low power draw for multi-year battery life. Best for Zigbee users with a hub (Mi Home/Aqara/ZHA); expect fixed 22mm gap mounting, adhesive mounting caveats, and no built-in Wi‑Fi hub.
Buyers running a Zigbee hub (Home Assistant/ZHA or Aqara/Mi Home) who need tiny, low‑power contact sensors; avoid if you want standalone Wi‑Fi sensors or outdoor-rated devices.
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