: Brochures Shipping & Return Policies Carbon Monoxide Detectors CO Sentinel Carbon Monoxide Detectors CO Sentinel Owners Manual and Installation Instructions Model CMD-4MR-RLY The CMD-4MR...-RLY is the most advanced CO detector available from Fireboy-Xintex. It features automatic generator shutdown capability. When dangerous carbon monoxide levels are detected, the CMD...-4MR-RLY shuts down the generator, a common source of CO. This detector also features multiple location warning, allowing up to six detectors to be relayed (linked) in series. When...