Main Features: 1. Smart ZigBee Siren Alarm with Sound Light Featured: The 2 in 1 alarm system with 90dB sound and flashing light is specially designed for smart home security with real-time alarm, detecting home status timely. 2. Functional Smart Scene Linkage with Tuya Gateway Required: Smart linkage of the sound alarm to other smart home devices for smart scenes where alarm condition is needed, even with a set schedule available to choose the running time to trigger the alarm at a preset time at your own request; Tuya ZigBee gateway is required for this Tuya ZigBee alarm and highly recommended than other hubs for its wider compatibility.3. Compatible with Tuya Smart/Smart Life App: Launch the alarm sensor via APP after adding it to Smart Life App, working as a doorbell; Monitor alarm record in APP for more convenience to keep safe in a much easier way; Remotely check the status under the scenes you set in APP.4. Advanced Features Available: Set alarm volume with low, high, medium