Wireless interconnectivity, wirelessly connect up to 18 one link alarms in your home and when one sounds, they all sound for increased whole home protection
120 VAC hardwired, easily replace one existing hardwired alarm with one link SA521 and then add one link battery operated alarms to connect wireless alarms with hardwired alarms when one sounds, they all sound
Battery backup, provides consistent protection for added safety during power outage
Photoelectric smoke sensing, optimal protection from smoldering fires. plus, reduces false alarms like those caused by cooking fires and shower steam
Mute button, mutes unnecessary alarms immediately. also tests alarm function with same button
Eco friendly, completely recyclable as an electronic device
EZ access battery door, no need to remove alarm from ceiling to change battery
