Serene Innovations CentralAlert Audio Alarm Sensor,2.5" x 3.8" x 1",Each,CA-AXPrice: USD39.95 Serene Innovations CentralAlert Notification System Audio Alarm Sensor detects the alarm sounds of virtually all audio smoke, gas and fire alarms, even the new alarms with T3 or T4 type alarm sounds and sends a wireless signal to trigger the CentralAlert receiver to notify you. It can be installed next to the existing alarms for sound detection or directly connected to your alarms for activation.Other products from H e a l t h P r o d u c t s F o r Y o u |