3. Compatible with Tuya Smart/Smart Life APP: Launch the alarm sensor via APP after adding it to Smart Life APP, works as a doorbell; monitor alarm recording in the app for convenience to keep home safe in a much easier way; Remotely check the status of the house under the scenes you set in the app. 2. Functional Smart Scene Linkage with Tuya Gateway Required: Links the smart sound alarm to other smart home devices for smart scenes where the alarm is needed, even with a schedule available to choose the runtime to trigger alarm at a preset time at your own request; Tuya ZigBee gateway is necessary for this Tuya ZigBee alarm and highly recommended than others for its compatibility. Main Features: 1. ZigBee Smart Siren with Sound Light Features: 2 in 1 alarm system with 90dB sound and flashing light specially designed for smart home security with real-time alarm, detecting home status in real time. 4. Advanced Features Available: Adjust alarm volume with low, high, medium and alarm time in the range of 0-30 min, even with 18 types of alarm ringtones optional for fun; Free on/off alarm via app for a more personalized user experience. 5. 100% wireless with simple installation: two charging methods are presented as USB charging or 2 CR123A batteries (not included), as well as the battery level displayed in the app.