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rotate the mounting bracket on the alarm, the alarm is activated 

and cannot be turned off without permanently disabling the 

alarm. You can remove the bracket for installation. The alarm 

remains activated and paired. Therefore it is best to install alarms 

shortly after being activated and as close as possible to the 

time the homeowner will occupy the home so the end user has 

maximum longevity and use of their alarm.

How to Pair Alarms

1.  Download the free App onto 

your iOS device from the App 

Store. Search for “Onelink 

Home by First Alert”. Installers 

only need one App to set up 

multiple homes or apartments. 

See image at right.

2.  Open App and follow instructions 

for setting up and pairing devices. You need to choose 

whether you are setting up the hardwired AC10-500 or the 

battery powered DC10-500 version on the App. For installers 

who are setting up multiple devices in multiple homes you 

need to assign a name to each home in the App and then pair 

the alarms to that home (maximum of 10 homes). This will 

keep alarms separate from other homes you set up. See App 

screens shown for an example of what this might look like.  

 

3.  Each alarm has a unique 

8 digit alphanumeric 

product code that is shown 

on the side of the alarm 

underneath the QR code. It 

will be similar to the label 

shown at the right.  

Carrier

100%

11:27 AM

123 Main Street

10547 Elm Street

125 Main Street

10552 Elm Street

Carrier

100%

11:27 AM

123 Main Street

Master Bedroom

Hallway

Basement

Pull down to update accessory list

Multiple Homes Setup

Multiple Alarms per Home 

Choose Alarm Type

AC10-A9CC

XXX-XX-XXX

Onelink App Download

Onelink App Screens

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