When regulations require you to test for CO (carbon monoxide) and fire, it can be difficult to keep wiring and costs low. The 4-Warn/CO detector incorporates four sensing elements in one unit to detect smoke, CO, flame and heat, which also assists in verifying true emergencies and deterring false alarms. When installed with the sounder base, this detector can reduce detection upgrade material and labor costs –  such as the separate wiring and installation costs, required bases, mini-horn, monitor module, conduit and junction box – by 54 percent.