note: 2xCR123A battery powered, not included size: 6.8 x 6.8 x 3.3cm Material: plastic colour: orange+white Package Contents: 2 x Siren Alarm 2 x USB Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 3. Tuya Smart/Smart Life APP Compatible: Launch Tap-to-run the alarm sensor via APP after adding it to Smart Life APP, performing as a door bell; Monitor alarm record in APP for added convenience to keep house safe in a much easier way; Remotely check house condition under the scenes you have set in APP. Main Features: 1. ZigBee Smart Siren Alarm with Sound Light Featured: 2 IN 1 alarm system with 90dB sound and flashing light is specially designed for smart home security with real-time alarm, detecting house condition timely. 2. Smart Scene Linkage Functional with Tuya Gateway Required: Intelligent linkage the audible alarm to other smart home devices for smart scenes where alarm condition needed, even with schedule set available for choosing execution time to trigger the alarm at a preset time to your own demand; Tuya ZigBee gateway is required for this Tuya ZigBee alarm and highly recommended than other for its compatibility. 4. Advanced Features Available: Set the alarm volume with low, high, medium and alarm time by the range from 0s-30min, even with 18 alarm ringtone types optional for enjoyment; Freely on/off alarm via APP for more personalized user experience. 5. 100% Wire-free with SimpleInstallation: Two charging methods are featured as USB charging or 2xCR123A battery powered(not included), together with battery level displayed in APP.