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 Adjustable Description: 1. Wifi USB Sound Light Alarm 2. Multiple Sound 3. Power Supply: Mini Usb, 5V-1A 4. Battery Powered: CR123A X 2 (Not Included) 5. Sound Size: 90 db 6. Wireless Frequency: 2.4GHZ 7. Protocol: Ieee 802.11b/g 8. Wifi Distance: 45m 9. Operating Temperature: 0C~60C (32F~104F) 10. Application: Tuya Smart/Smart Life. 11.Supported System: Android And . 12. Support For Third Parties: And Google Home. 13. Usb Port Power Or Battery Power 14. Size: 6.8x 6.8x 3cm Material: ABS Color as shown Package Contents: 1 x Sound Light Alarm 1 x English Instruction Manual 1 x USB Charging 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.