Home Security System - Home Alarm System User Manual
  Page 1 of 9    CM2837 
**Interconnected alarms provide added 
warning as compared to single alarms. 
Bridge Unit 
120V AC Hardwired 
Smoke Alarm 
SA520B
Battery Smoke/CO 
Combination Alarm 
with Voice 
SCO500B
Battery 
Smoke Alarm 
with Voice 
SA511B
Battery Carbon 
Monoxide Alarm 
with Voice 
CO511B
WIRELESS 
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First Alert
®
 OneLink
®
 is a line of wirelessly interconnectable alarms designed to meet the 
needs of contractors that retrofit or remodel existing properties. First Alert® 
OneLink® offers the same interconnected functionality as hardwired alarms, 
without the wires. Because there are no wires to pull through existing walls, 
First Alert® OneLink® offers a very cost effective way to bring existing 
properties up to code. Using First Alert® OneLink® provides faster job 
turnaround vs. hardwire retrofitting applications. Up to 4X more jobs completed 
means increased profits and customer satisfaction. 
The product line consists of mostly battery operated alarms making installation fast and easy. 
A hardwired bridge unit is used to connect existing hardwired alarms to the new First Alert® 
OneLink® enabled alarms providing a complete system, old and new. With exclusive features 
like Voice Warning with Location™, Optipath 360 Technology™ and Spread Spectrum Horn 
Tone, First Alert has the most complete lineup of wireless smoke and CO products: 









