Bosch Intrusion Photoelectric Smoke/Heat/Carbon Monoxide Detector, 24v

Photoelectric Smoke, Heat, Carbon Monoxide Detector with +135° F Heat Sensor, 12 or 24V DC, Wire-In, Size: 6.75" Diameter, 2.25" Depth, Color: White. For use with 2 or 4-Wire F220 Series Detector Base. * * Note: The F220-PTHC detects carbon monoxide (CO) as a component of a fire. It is not a CO detector and cannot activate an alarm in the presence of CO only * *