First Alert Wireless Smoke Detector with Battery Backup. Expand protection to include existing hardwired detectors and new wireless detectors by replacing one existing hardwired alarm with a First Alert Wireless Alarm. By adding wireless battery operated alarms elsewhere; when one alarm sounds in either series of alarms; all alarms will be notified. Easily link alarms together with the press of a button. Photoelectric smoke sensor reduces nuisance alarms from cooking smoke or shower steam. Easy access battery drawer: no need to remove alarm from ceiling to change battery. 10-year limited warranty. Meets UL standards.
* This product is intended for non-professional do it yourself installation. If you would like information about a professionally installed and monitored system, please contact First Alert Professional at 1-800-921-6025. First Alert Professional is not affiliated with BRK Brands, Inc.