1. 120DB WIFI/Siren Sound Alarm 2. Built-in li-battery, work as on-site alarm sytem when power off. 3. Work with smart socket and camera. 4. Arm/Disarm/Notification 5. Can add 24 accessories, 8 remote controls The wireless distance is 100 meters. Work with all TUYA smart products. Tamper/power off/power on notification Volume is adjustable, flash light turn on/off is available. The accessory name can be Different system can be link and work together. Scheduled Arm/Disarm The camera can be connected, camera with motion detection recording&picture Support for , for Tmall Wizard, for Assistant. Arm:alarm with soud and light flash Home Arm:only light flash to alarm Disarm:only SOS alarm available Remote controls:max 8 Detectors:max 24 Volume:high / medium / low Beep time:1-180 seconds adjustable Timing control:arm / home arm / disarm Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Color: As Shown Material: plastic Package Contents: 1 x Siren 1 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.