Easy to install 104dB siren Tamper alerts Battery back up The Yale Sync Powered External Siren is easy to pair with your Yale Sync Smart Home Alarm.Tailored for your needs, the Yale Sync Powered External Siren is the ideal visual deterrent for arming your home and improving your home security for enhanced peace of mind. Simply plug into the mains and connect to your Yale Home App through your phone or tablet for quick, easy installation, set-up and control. Check in from anywhere in the world and receive alerts and real-time notifications when your alarm is triggered. The handy geolocation feature reminds you to set the alarm when youre leaving home, giving you one less thing to worry about.Powered by a 12v power supply, this product has a 104dB siren and tamper alerts sent directly to your phone/smart watch. No need to change batteries or worry about power failure, as the Siren comes with a built-in backup battery powered generator for greater reliability. Cable length is 175cm wth p