The First Alert Hardwired Combination Smoke and Carbon Monoxide Alarm uses an electrochemical CO sensing technology and Ionization sensor for smoke detection. It includes a 9-volt battery for continued function in the event of a power outage, and it features a test/silence button, tamper-resistant locking brackets, and a universal mounting bracket. This CO smoke detector can be connected to other compatible BRK and First Alert hardwired smoke and carbon monoxide detectors. Its latching alarm indicator automatically identifies which unit initiated the alarm–even after the conditions that set off the alarm have subsided.

• Hardwired CO smoke alarm features battery backup for constant monitoring
• Can connect to other compatible BRK or First Alert CO smoke detectors
• Lights indicate if the alarm is for smoke or for carbon monoxide
• Single test/silence button for simple operation
• Side-load battery compartment for convenience

Shipping Note: Shipping to Alaska, Hawaii, and PO Boxes is not available for this item

Warranty:  10 Year Limited Manufacturer Warranty