Serene SI-CA-AX Centralalert Audio Alarm Sensor

- Mount it next to your audio alarms for alarm sound detection. It is the only sensor that will respond to all alarm sounds, including those alarms with T3 or T4 type sounds- It can also be hardwired to your audio alarms that comes with connecting terminals for direct activation- It sends a wireless signal to activate the CA360 to alert you- Battery powered (batteries not included) with low battery indicator- Advanced Technology: 2.4 Ghz Smart-Code- Operating range: Up to 200ft, open space - actual distance varies according to house construction-Up to 10 Model CA-AX's are supported by a system- Battery type: Two AA size alkaline- Battery life: up to 10 months- Operating temperature: + 10 to +30°CSICAAX