First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup Best Price For Sale
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First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup Product Features
- 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
First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup Reviews
| 10 of 11 people found the following review helpful:  Must Have for Older Homes, By JMR (Charlotte, NC United States) - See all my reviews Amazon Verified Purchase This review is from: First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup (Tools & Home Improvement) 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... Read more 7 of 7 people found the following review helpful:  Unpredictable?, By JHN (Nebraska USofA) - See all my reviews This review is from: First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup (Tools & Home Improvement) I have 7 of the First Alert SA520 Onelink units that were installed in my home 2.5 yrs ago. They were easy to set up although getting power to each unit in an older, 3-story home was the biggest challenge. They link to each other well. You may wish to install them in a particular sequence if using many of them on different floors. That way when the first one goes off, you might have a fighting chance of knowing which one it is since that one sounds off first. The reason I say this is because ours have begun going off in the middle of the night for no apparent reason. It has happened 4 times in about 4 months, and we never know when it will happen. They start sounding the alarm but shut off after about 20 secs, by themselves. We thought we had one defective unit but after removing it several days ago, they went off again tonight (6pm). All the other times have been when we were dead asleep, and boy is that a shock! These units are LOUD! Gave it four stars for loudness... Read more 2 of 2 people found the following review helpful: worth the $, high-quality, easy, so far so good, By Jiminy Cricket (downstate NY USA) - See all my reviews Amazon Verified Purchase This review is from: First Alert SA521CN ONELINK Hardwire Wireless Smoke Alarm with Battery Backup (Tools & Home Improvement) Bought 6 of these to replace my 13-year old BRKs. Easy to install. The wireless "mesh" interconnect feature was very easy to set up and seems extremely well designed. [The sensors in your "mesh" all recognize and talk to each other so that any sensor can trigger any or all the others, but they all ignore any sensors not programmed into their little network, i.e. they supposedly ignore the neighbors sensors. Also, if one sensor is remote, it only needs to be able to reach one other sensor in the net. It does not need to be able to reach all others...they will relay the alert.] They can also easily link into any existing hard-wired interconnect system in addition to the wireless. Also I like the combination of battery backup and hard-wired power. I also like the one button operation. Press the button to test, and press it again to silence any alert. So far so good. I think they are definitely worth the extra $ for trouble-free reliable detectors... Read more |
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