carbon monoxide & smoke combination alarms
first alert sa521cn 3st onelink wireless hardwired smoke alarm
ul 120v ac hardwired easily replace one existing hardwired alarm with onelink sa521 and then add onelink battery operated alarms to connect wireless alarms with hardwired alarms when one sounds they all sound li battery backup provides consistent protection for added safety during power outages li photoelectric smoke sensing optimal protection from smoldering fires li reduces false alarms like those caused by cooking fires and shower steam li mute button mutes unnecessary alarms immediately . also tests alarm function with same button li eco friendly completely recyclable as an electronic device li ez access battery door no need to remove alarm from ceiling to change battery li optional theft prevention lock when activated batteries and or alarm can not be removed without proper tools li 2aa batteries included li loud 85db alarm li 10 year limited warranty li smoke alarms should be replaced every 10 years for maximum protection li meets ul217 standard li fcc compliant . ul
first alert
ul wirelessly interconnect alarms . 120vac hardwired wireless interconnect smoke alarm with battery backup . to expand protection to include both existing hardwired alarms and new wireless alarms simply replace one existing hardwired alarm with onelink then add onelink battery operated alarms elsewhere and when one alarm in either series alarms all alarms will be notified . easily link alarms together with the press of a button . when one alarm sounds they all sound for maximum whole home protection . 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 . ul