brk co511b first alert carbon monoxide detector wireless alarm w voice 9v

BRK Wireless Interconnect Alarms provide a cost effective solution when it comes to renovation and retrofit projects where interconnectability is a requirement. Easily interconnect between floors and new to existing construction wirelessly. Features: » BRK Wireless Interconnect enabled alarm» Voice alarm with programmable location. Programmable with up to eleven locations.» Single button test/silence» Two silence features - can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarm» RF Interconnect: reliable and secure radio frequency communication between alarms. 915 MHz frequency with 65,000 security codes and 3 channel frequency hopping.» Optipath 360 TechnologyTM - patented technology provides 360 degrees of direct access to the smoke sensor.» Perfect Mount - allows for easy alignment of alarm» Spread Spectrum Horn Tone - Lower and varying frequency makes it easier for the elderly with normal aged related hearing loss to hear the h