|Item Weight||1 pounds|
|Product Dimensions||5 x 2 x 5 inches|
|Item model number||SA521CN-4|
First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup (4 Pack)
|Price:||$147.99 ($37.00 / Package) & FREE Shipping|
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- Hardwire, interconnected 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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Top Customer Reviews
Gave it four stars for loudness and ease of setup. Minus one star for this bad habit I've described. Anyone know what might be causing this? Can they be tripped by RF interference? Says on the back that they "have to accept interference even if detrimental." (Who thought that one up?)
FOLLOW UP LATER.....
I discovered that the unit that was giving me trouble was near a ceiling fan on a dimmer switch that must have been sending dirty power into the circuit while it was running (as motors can do). when the fan is not running, i haven't had the problem with the false alarm. my suggestion is to narrow the search to find the one sending the alarm and take it off of the line power and run it only on the batteries to see if a dimmer or motor is causing the problem.
On the plus side they have a 10 year warrenty and First Alert doesn't seem to hassle about returns.
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!
Installing the expansion detectors and getting them all to talk to each other was a little more time consuming. One note of advice: If you install this one first, leave your ladder out under this one until you have all the new expansion detectors programmed because you have to be able to push the button on the this one to during the programming of the new expansion ones.
The only reason to buy this unit is if you have a wired system and you want to add wireless ONELINK units in new locations and have everything alarm together if one system detects smoke/CO. You should only need only one of this model and then combine it with unwired ONELINK units in your new locations. Worked perfectly for me and only took a little over an hour to add 3 new alarm locations.
Most Recent Customer Reviews
Work fine but very hard to setup and interconnect. Had to call tech support twice after trying for hours while reading the manual.Published 7 days ago by Chris H
This is a great way to have smoke alarms throughout the house sound if your home is older and wasn't wired for tandem sounding. Great product. Read morePublished 10 days ago by Alex
I bought these with the "First Alert SA501CN2 Interconnected Wireless Battery Operated Smoke Alarm, 2-Pack" and setup was easy as could be. Read morePublished 20 days ago by Stefanie Evans
I am very pleased with this product. Initially, I was hesitant after reading s few negative reviews, i.e., detectors going off for no reason or beeping. Read morePublished 29 days ago by Mr. McPheebee
A great addition to the wireless talking one link as it allowed me to incorporate the hardwired system as well. Kudos for doing a great job on this product.Published 1 month ago by James P.. Waigand
received the same day love that prime had it up in 15 minutes works as it should would buy againPublished 1 month ago by mark s
I had two hard wired smoke alarms and these allowed me to add wireless additions for a truly interconnected system. Read morePublished 1 month ago by Tim Bush
Liked the features, works with wireless battery units and other hardwired units, but this unit was defective and had to have it replaced by manufacturer first alert. Read morePublished 1 month ago by Amazon Customer
Goes off unexpectedly when there is nothing cooking or any possible fire. Battery runs out quickly and then chirps only in the middle of the night. Read morePublished 1 month ago by Gary J Novak