The siren can be remotely activated/deactivated in Smart Life/Tuya Smart App. Push alarm notifications to your phone. This smart siren can alarm automatically by interworking with other Tuya Smart Home products (such as door sensor, PIR motion sensor, etc.). Built-in 90dB speaker with visual light alert strobe, scares off intruders. Long-term power supply via USB cable, and can use the battery as a backup battery. Pre-loaded 18 kinds of optional alarm sound, high/middle/low three-level volume adjustable, 0-1800s alarm duration adjustable Description: 1. USB Wifi Sound Light Alarm 2. Multiple Sound Options 3. Power Supply: Mini USB, 5V-1A 4. Battery powered: CR123A X 2 (not included) 5. Sound size: 90db 6. Wireless frequency: 2.4GHZ 7. Protocol: Ieee 802.11b/g 8. Wi-Fi distance: 45m 9. Operating temperature: 0°C to 60°C (32°F to 104°F) 10. APP: Tuya Smart/Smart Life. 11. Supported system: Android and . 12. Third-party support: Alexa and Home. 13. Powered by USB port or battery power