BRK First Alert Onelink Wireless 120 Volt AC/DC Smoke Detector SA520B Overview

BRK First Alert Onelink Wireless 120 Volt AC/DC Smoke Detector SA520B The BRK Firs Alert Wireless 120 Volt AC/DC powered smoke detector has interconnectivity and can wirelessly connect up to 18 Onelink alarms in your home and when one sounds, they all sound for increased whole-home protection. 120V AC hardwired, easily replace one existing hardwired alarm with Onelink SA520B and then add Onelink 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 outages. 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. Optional theft-prevention lock, when activated, batteries and/or alarm cannot be removed without proper tools. 2AA batteries included. Loud 85db alarm. 10-year limited warranty. Smoke alarms should be replaced every 10 years for maximum protection. Meets UL217 standard and FCC compliant. NOTE TO CONTRACTORS IN MARYLAND. FULL CASES OF 12 EACH CAN BE DROPPED SHIPPED FROM FACTORY TO EXPEDITE ORDERS. NEED MORE AND WANT TO SEE OUR COMPLETE LINE OF SMOKE AND CARBON MONOXIDE DETECTORS. JUST CLICK ON THE UNDERLINED LINK NEAR THE TOP OF THIS PAGE THAT SAYS KIDDE AND FIRST ALERT SMOKE AND CO DETECTORS.