Wired CO detectors connect to building power and may interconnect with compatible alarms, while wireless CO detectors typically use batteries and radio communication with a compatible security panel, which can simplify placement where wiring is difficult. System integration depends on the detector and platform, with some devices reporting alarm, tamper, and battery conditions to a panel, while listener sensors detect the sound of existing alarms.

Direct-sensing CO detectors use an electrochemical sensor to measure carbon monoxide and can provide their own audible and visual alarm, along with wireless alerts to a compatible security panel. Listener devices do not measure CO directly, but detect the sound of an existing smoke or CO alarm and relay an alert, which can help monitor interconnected alarms without replacing them.

Place CO detectors on each level of the property, outside sleeping areas, and near fuel-burning appliances or attached garages when permitted by local codes and manufacturer instructions. For listener-style devices, mount the unit near existing smoke or CO alarms so it can detect their audible alerts and communicate them to the security system.

CO detectors in this category can provide local audible alarms, including built-in sounders, along with visual indicators such as flashing LEDs, multicolor LEDs, or a 360-degree LED ring. Wireless models can also send alarm signals to a compatible security panel, while some report low-battery status, tamper conditions, and battery-related alerts for faster follow-up.