Hardwired carbon monoxide alarm with battery back-up meets codes where CO alarms are required for new construction. PRODUCT FEATURES:- 7 YR CO Sensor/7 YR End of Life - Electrochemical Carbon Monoxide Sensor - the most accurate sensor available as compared to other sensing technologies - 9V Alkaline Battery Backup - Latching alarm indicator - remembers which unit initiated an alarm - Two silence features - can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarm - Intelligent Sensing Technology  helps reduce the number of nuisance alarms - Dust Cover - Easy Installation/Maintenance - Preferred features include a large opening in the mounting bracket for easy access to wiring. Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation. A battery pull tab keeps the battery fresh until the home is occupied. Battery installation and removal can occur while the unit is mounted to the ceiling or wall via the side load battery compartment. Two locking features are provided to prevent battery theft and/or theft of the unit. Connection to AC power is made with a "Quick-Connect" wiring harness. Installation is quick, easy and cost effective. - End of Life Signal provides audible notification alarms needs to be replaced - Single button test/silence - 10-Year Limited Warranty