Sonoff SNZB-04P is a Zigbee 3.0 door/window contact sensor with a CR2477 coin cell and a Hall-effect magnetic sensor; it also exposes battery percentage and a tamper alert. In short: reliable multi-year battery life (CR2477) and solid Zigbee compatibility make it a strong choice for local Home Assistant or Zigbee2MQTT setups, but remember it is a battery-powered EndDevice (won't route) and requires a Zigbee coordinator.
For home automators who want local Zigbee contact sensors with long CR2477 battery life and Home Assistant/Zigbee2MQTT compatibility; avoid if you need devices to act as Zigbee routers or require flawless ZHA tamper support.
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