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LifeShield’s patented Siren Detector is an easy and inexpensive way to get comprehensive fire, smoke and carbon monoxide monitoring. When there is smoke, fire, or carbon monoxide in your home and your existing detector sounds a loud alarm, the Siren Detector “hears” the alarm and sends a signal to the Central Monitoring Station to send help.  
Troubleshooting Siren Detector Issues:
Sensor Not Found
"Low Batt" (Low Battery)
"TMPR" (Tamper)