Serene CentralAlert Accessory - CAFACO Smoke + CO Detector with Audio Transmitter

The Central Alert Audio Transmitter CAAX detects the audio alarm of the smoke and carbon monoxide detector, and sends a wireless signal to compatible CentralAlert notification units. NOTE: Compatible with CentralAlert receivers include:  CA360, CAPX, and CARX This transmitter listens for the T3 and T4 signals from the smoke & carbon monoxide detector Compatible CentralAlert receivers include:  CA360, CA-380, CAPX, and CARX UL listed, smoke and CO detector with sealed in 10 year lithium battery UL listed, smoke and CO detector with sealed in 10 year lithium battery Wireless transmitter detects T3, T4, and traditional alarm sounds Range: up to 200 ft in open space Backup battery functions for at least 7 days