\u3010105dB Loud Alarm\u3011Deliver powerful security alerts with up to 105dB alarm volume. Choose from 4 volume levels and adjust settings anytime via the app to fit different environments.\u3010Flexible Sound & Light Alerts\u3011Customize your alarm modes with sound only, light only, or synchronized sound and light alerts for different security scenarios.\u301010 Custom Alarm Tones\u3011Built-in 10 alarm tones help assign unique sounds to different areas or events, allowing you to quickly identify alerts.\u3010Dual Power Supply\u3011Built-in backup battery keeps the device running during power outages, providing up to 300 days of operation in silent mode. When USB power is restored, the backup battery automatically recharges.\u3010Zigbee Smart Security Automation\u3011Connect with ...\n\n\r\n\r\n\n\r\n\nSONOFF SNZB-09P Zigbee Smart Indoor Siren 105dB Alarm USB-C Home Security System\n\r\n\u3010105dB Loud Alarm\u3011Deliver powerful security alerts with up to 105dB alarm volume..