First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup

Other products by First Alert

Product Description

Amazon.com Product Description

In the event of a fire every second counts. If a fire were to begin in your basement and the alarm there sounded, you may not hear it right away if you're sound asleep two floors up. With traditional battery-operated alarms, you lose valuable time waiting for the smoke to rise to another alarm, on another level, before the alarm on your floor sounds. But with First Alert ONELINK alarms, if one detects danger, they all sound. This can alert you sooner, and it increases your chances of getting out safely.

Until now, alarms that could signal each other were only available in homes with hardwired alarms requiring installation from an electrician. But First Alert ONELINK alarms communicate without wires.

The First Alert ONELINK SA501CN alarm uses photoelectric sensing technology which is environmentally friendlier and which reduces nuisance alarms, making it ideal for cooking areas. It is also great for sensing slow smoldering fires quickly. The alarm includes a low battery warning and a super bright escape light. You can easily expand an existing interconnected 120-volt AC system by replacing one alarm in the series with this alarm. The test/silence button both silences a non-threatening alarm or low battery warning and allows you to test the unit's functionality. The AA batteries are easy to install in the convenient pullout battery drawer. Two AA batteries included.--Bree Norlander

What's in the Box
One smoke alarm, two AA batteries, and user's manual

Product Details

Fire Detection and Protection Fact Sheet [27kb PDF]

• Item Weight: 1.5 pounds
• Shipping Weight: 12.8 ounces (View shipping rates and policies)
• Shipping: Currently, item can be shipped only within the U.S.
• ASIN: B000EVO9D4
• Item model number: SA521CN
• Average Customer Review: 4.8 out of 5 stars  See all reviews (5 customer reviews)
• Amazon.com Sales Rank: #9,682 in Home Improvement (See Bestsellers in Home Improvement)

  Popular in these categories: (What's this?)

  #40 in	Home Improvement > Fire Safety & Home Security > Fire Safety > Smoke Alarms
  #99 in	Home Improvement > Fire Safety & Home Security > Household Sensors & Alarms

Customer Reviews

Most Helpful Customer Reviews

5 of 6 people found the following review helpful:

5.0 out of 5 stars Must Have for Older Homes, September 6, 2008

By	JMR (Charlotte, NC United States) - See all my reviews

Our home was built in the late-70's so we had a hardwired smoke alarm on each floor but they were not interconnected, not to mention they didn't have a battery backup. If we were sleeping, could we expect to hear the alarm on another floor, on the opposite side of the house? That's a bet I'm not willing to take, so we spent the extra money on two of these. We also plan on buying a couple of the battery only ONELINK alarms to expand our safety and coverage without hiring an electrician to install.
To program, you insert batteries and close the battery door on one unit; then you insert batteries on the second unit, press a button on the second unit, then press a button on the first unit. Inserting batteries and programming took under two minutes for two alarms. My (getting better but still not what I'd call "handy") husband had the alarms installed in under five minutes each. So, I'd consider them pretty easy to install.
During testing, they communicated well together and they seem loud. Of course, the real test for any fire alarm is during a real fire but I'm not really into burning my house down for the sake of a review. Therefore, I'm giving it five stars and calling it done!

1 of 1 people found the following review helpful:

5.0 out of 5 stars interlinked without expensive wiring, July 18, 2008

By	J. Walton "Playful Jay" (Georgetown, SC) - See all my reviews (REAL NAME)

Read programming directions carefully. Product works as promised, one goes off they all go off. Find that lithium batteries only last 2 years in them not 9 or 10.

4.0 out of 5 stars Outstanding customer service, October 22, 2009

By	M. Titus (Shawnee KS United States) - See all my reviews (REAL NAME)

Amazon Verified Purchase

I replaced my 15 year old alarms with several models, including this one, from BRK/First alert. Everything worked great, including the wireless ones talking to each other; except for the wired/wireless unit. I though the unit was defective and BRK sent me a replacement immediately. I still had problems. BRK is sending me another replacement; but suggested that it was a wring issue with an old dimmer switch on the same circuit. I still need to replace the dimmer; but just wanted to highlight the great customer service.