Aqara Door Window Sensor E1 (MCCGQ14LM) is a Zigbee 3.0 contact sensor that exposes contact state, battery percentage/voltage, and a battery_low flag — it reports contact changes immediately but is a sleepy end device so battery percentage updates can lag up to 24 hours; also requires up-to-date adapter firmware for full functionality. Good choice for Zigbee/Home Assistant setups that need reliable contact events and voltage reporting, but avoid it if you need fast battery percentage polling or built-in ambient temperature sensing.
Buy if you run Zigbee2MQTT/Home Assistant and need immediate contact events and voltage reporting; avoid if you require fast battery percentage updates or built-in ambient temperature sensing.
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