First Alert 3120B vs First Alert SA511CN2-3ST Interconnected Wireless Smoke Alarm with Voice Location

I bought seven of these to replace the wire-connected units in my house. A few key advantages over the comparable Kidde PI2010: Most important is that the LED tells you which one sounded the alarm AND which one needs a new battery. If you have ever stood in a house with wired alarms at 2 in the freeekin' morning, trying to pinpoint the damn -bip- every minute, you will know how much swearing this feature eliminates. Trust me: This feature is a must

The photoelectric sensor inside is quick to detect slow, smoldering fires. With a single silenced test button on the Fernley alarm, you can easily per...

This is a pretty good smoke detector. We ordered six of them to replace increasingly annoying, late-night-chirping, 10 year old units by another manufacturer. We wanted a dual sensor (photoelectric and ionization) detector with 10-year batteries but were unable to find any that fit the bill, and so settled for the 3120B - at least the batteries were AA instead of the more expensive 9 volt. We've had a little trouble with them - the reason for four stars instead of five

This is nice when you have 8 of these going off in your two story house. I have not placed any alarms in my kitchen, however one of these is in the adjacent room. Over the course of a year, I have had probably 2 times that the alarms have gone off from bad cooking. For the most part false alarms have not been an issue

Strip 1/2" off the ends of the new wires. In my case, two of the wires were pre-stripped, but the orange interconnect wire needed to be stripped. It is easier to do this before you start installing the detector on the ceiling 4. Remove the old detector from the base by rotating it counter-clockwise

Another worry.. if they continue to give false alarms we may eventually be desensitized to react fast IF THERE REALLY IS A FIRE. If it wasn't beyond the return window I would definitely send these back for replacements

Purchased qty 6 of the BRK3120B photoelectric/Ionization, qty 2 BRK SC7010B Carbon Monoxide/Photoelectric, and Qty 1 BRK HD6135FB 135F fixed 15F rise heat detector. All of these are AC/DC battery back-up detectors that are wired off same AC circuit and all have their Orange wires all connected in Parallel as interconnected so any alarm event will sound every detectors alarm. All were tested for this interconnection and all worked as designed. They all replaced FireX G13 20 year old detectors and one older heat sensor

So batteries need to be changed yearly with most detectors anyway. Even wired detectors have batteries in them and need to be replaced. I am replacing my Smoke/Carbon Monoxide OneLink with new Smoke/Carbon Monoxide OneLinks now that the detectors told me they are malfunctioning, manufacturer date listed on back of detector. 7 years and 4 months after manufacturing, not bad

Lastly, be sure to replace any brand of smoke detectors after 10 years from their manufacturing date (usually found on the back of the alarm). Good Luck - I hope this helps.

Like the smoke detector fine worked well bought it December 2019 failed August 2021 called the company free replacement free shipment pretty good stand behind their equipment I would buy again.

Customer service asked me to clean them with a can of condensed air once per month. If it still happens to call back. I've noticed that all of the false alarms have been with the windows open, mainly at night. I hope there is not a real fire because these alarms are crying wolf

they communicate to each other, like the voice telling which alarm is going off. no false alarms.

The next day, I heard 3 chirps come from the guest room, silent for about 15 minutes, and the 3 more chirps, then nothing for several more hours. This same issue repeats itself in the master bedroom, and my son's room (all units on the upper level of our house). According to the owner's manual, 3 chirps every five minutes means a malfunction and you should replace the unit immediately. I had just barely purchased the units and they're already malfunctioning? My issue with this is that it isn't happening every five minutes, it is completely a guess when the next chirp will be

Overall, a good product and highly recommended in an older home where alarms aren't already interconnected by hardwire.