First Alert is a state of the art wireless combination smoke and CO alarm designed to provide early warning of a fire or Carbon Monoxide. It features a fully insect screened Photoelectric smoke sensing chamber and an electrochemical carbon monoxide sensor, an 85dB horn, a supervised 3V (2 AA batteries) power supply, a full function test switch and a silence feature. This combination alarm will operate with 3rd party, certified Z-Wave devices and the basic command class required by all Z-Wave devices. By the requirements of the Device Class spec, this command class does not have to be mapped to any particular functionality for this device.