The First Alert BRK Hardwired Talking Precision Detection Smoke and Carbon Monoxide Alarm features the most advanced detection available. The exclusive Precision Detection voice alarm not only alerts you whether the threat is smoke or carbon monoxide, but also tells you the location of the danger; you can pre-program up to 11 locations in your home. The 120-volt CO smoke detector is designed to be hardwired into your home or office and offers a battery backup for continued functionality in the event of a power outage. The one-touch silence/test button makes it easy to operate. Connect them to other compatible hardwired detectors as part of a system for larger spaces. This kit also includes universal adaptors for a quick and easy installation with most existing First Alert®, BRK®, Kidde®, and Firex® Alarms which would typically require them to be rewired.
Features: 
Advanced Precision Detection technology
Precision Detection provides less nuisance alarms and an earlier warning to the most common types of fires
Interconnectable with existing BRK/First Alert hardwire Alarms
Also included are Universal Adaptors Included for Quick and Easy Install with Existing First Alert®, BRK®, Kidde®, and Firex® Alarms without rewiring
2-in-1 Protection from Smoke & Carbon Monoxide (CO)
Voice alert says what and where the threat is located
Meets UL217 8th Edition Smoke Standards
Meets UL2034 4th Edition Carbon Monoxide Standards
Includes: 
Advanced Precision Detection Technology
2 Alarms
2 Mounting Brackets
2 AA Batteries per alarm
2 Wiring harnesses
2 sets of universal easy connect adaptors for easy connections to most installed alarms 
Owner’s manual
Specifications: 
Operating Voltage: 120V AC 60Hz with 3V alkaline battery backup (two 1.5V)
Dimensions: 5.0” diameter x 2.0”H 
Weight: 9.3 oz
Designed to meet or exceeds municipal building codes
Warranty: 
10 -Year – visit www.firstalert.com for details
Details found in manual