Serene CA-AX is a wireless audio sensor designed to monitor alarm sounds, such as those from smoke or carbon monoxide detectors. It can detect continuous sounds or specific patterns like beeping sequences. The detected audio triggers a wireless signal to activate a compatible CentralAlert™ Master Unit and any connected receiver units, alerting you to potential emergencies. This device operates on a 2.4GHz Smart-Code technology and has a range of up to 200 feet in open spaces.