The Siren Can Be Turned On/Off Remotely In Smart Life/Tuya Smart App.Push Alarm Notifications To Your Phone.This Smart Siren Can Make Alarm Automatically By Interworking With Other Tuya Smart (Such As Door Sensor, Pir Motion Sensor, Etc). Built-In 90db Loud Speaker With Visual Light Alert Strobe, Scare Off The Intruders.Long-Term Power Supply Via Usb Cable,And Can Use Battery As A Backup Battery.Pre-Loaded 18 Kinds Of Optional Alarm Sound,High/Medium/Low Three Level Volume Adjustable,0-1800s Alarm Duration AdjustableDescription:1. Wifi USB Sound Light Alarm2. Multiple Sound3. Power Supply: Mini Usb, 5V-1A4. Battery Powered: CR123A X 2 (Not Included)5. Sound Size: 90 db6. Wireless Frequency: 2.4GHZ7. Protocol: Ieee 802.11b/g8. Wifi Distance: 45m9. Operating Temperature: 0C~60C (32F~104F)10. Application: Tuya Smart/Smart Life.11.Supported System: Android And .12. Support For Third Parties: Alexa And Google Home.13. Usb Port Power Or Battery Power14. Size: 6.8x 6.8x 3cmMaterial: ABSColor as shownPackage Contents:1 x Sound Light Alarm1 x English Instruction Manual1 x USB Charging CableOnly 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.