Zigbee 3.0 Door & Window Contact Sensor — Smart Home Security Sensor for Home Assistant, Alexa & Yandex

Know the moment a door or window opens. This CriticalZone Zigbee 3.0 contact sensor instantly alerts your smart home system when a door or window is opened or closed. Fully compliant with the standard Zigbee 3.0 protocol, it works seamlessly with Home Assistant (ZHA & Zigbee2MQTT), Alexa, and Yandex Alice — no proprietary hub required, just a standard Zigbee 3.0 gateway.

Note: A Zigbee 3.0 hub/gateway is required. Not compatible with EWeLink or SONOFF gateways.

• Zigbee 3.0 (IEEE 802.15.4) — standard protocol for broad compatibility
• Works with Home Assistant (ZHA & Zigbee2MQTT), Alexa, and Yandex Alice
• Magnetic trigger distance: ≤10mm — reliable open/close detection
• CR2032 battery included — over 1-year battery life
• CE, FCC & RoHS certified — safe and compliant
• Compact size: sensor 52.5x26.5x13mm | magnet 34.5x12.5x13mm
• Operating temperature: -10°C to 55°C