First Alert ZCOMBO is a state-of-the-art wireless combination smoke and CO alarm designed to provide early warning of a fire or CO. 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, utilizes one test button to setup, test and silence. This combination alarm will operate with 3rd party, certified Z-Wave devices enabled with the First Alert protocol and the basic command class required by all Z-Wave devices. First Alert ZCOMBO also includes the Smart Start feature which allows a faster and more intuitive connection of device to hub and on-boarding via use of QR code scan located on device. By the requirements of the Device Class spec, this command class does not have to be mapped to any particular functionality for this device. The alarm supports one association group with up to 1 node and sends its alarms to that group. The alarm supports configuration parameter #1, which has a size of 1, a default value of 0, and when set to 1 causes the device to send double alarm messages. Upon the detection of smoke or CO conditions, the alarm reports smoke and or CO detected to the controller. The device shall send the applicable message when the conditions are cleared. These notifications must be wrapped in the Supervision CC. The following notifications must be supported. The alarm sends a ~Heartbeat~ signal to hub periodically to confirm operability. It also features tamper resistant locking pins that lock alarm to the mounting bracket and battery drawer to prevent removal of battery or alarm. Designed for wall or ceiling mounting. Includes mounting anchors and screws.