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First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup | 
| Brand: First Alert
List Price: $75.99
Buy New: $49.30
You Save: $26.69 (35%)
New (24) from $49.30
Rating:  1 reviews
Sales Rank: 17124
Media: Tools & Hardware
Shipping Weight (lbs): 0.8
Dimensions (in): 9.9 x 6.4 x 2.6
MPN: SA520CN-3ST
Model: SA521CN
UPC: 029054002440
EAN: 0029054002440
ASIN: B000EVO9D4
Release Date: May 2, 2007
Availability: Usually ships in 1-2 business days
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| Features:
| • | Hardwire wireless smoke alarm with battery backup | | • | Uses photoelectric sensing technology which is environmentally friendlier | | • | Low battery warning; simple to use silence/test button; pullout battery drawer | | • | Add additional battery operated First Alert ONELINK alarms to expand without wires | | • | 120-volt with 2 AA battery backup |
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| Editorial Reviews:
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
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| Customer Reviews:
Must Have for Older Homes September 6, 2008
JMR (Charlotte, NC United States)
2 out of 2 found this review helpful
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!
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