The Photoelectric Smoke detector and the Carbon Monoxide (CO)detector are both listed Analog Addressable detectors compatible with fire alarm control panels that utilize the Potter Addressable Device (PAD) protocol. The CO sensing portion utilizes a proven electrochemical sensor for accurate detection of CO gas for life safety applications. The photoelectric detector complies with UL 268 7th edition enhanced smoke sensitivity tests. It has a wide sensitivity range of 1.1 to 3.5% per foot, and features drift compensation with built in dirty detector warning. The detector and the control panel communicate over a proven and robust digital communication path and the system analyzes the information at the particular device. The total polling speed is less than five (5) seconds, well under the UL requirements. The detector is compatible with any of the PAD300 series detector bases and simply twists on. The PAD300-PCD is addressed using DIP switches in the rear of the detector and can be easily programmed in the field without special tools.