Sonoff SNZB-04P is a Zigbee 3.0 contact sensor with a CR2477 coin cell and Hall-effect magnetic detection; it pairs quickly and follows the Zigbee spec for reliable third‑party coordinator operation. Strong battery life and local Home Assistant compatibility make it a solid budget smart-home contact sensor for people who run a Zigbee coordinator, but note it’s an EndDevice (won’t route) and has a larger, blocky magnetized housing that can complicate installation.
Buyers who run a local Zigbee coordinator (Home Assistant/Zigbee2MQTT/ZHA) and want long battery life; avoid if you need devices to act as mesh routers or want the smallest, most discreet sensor.
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