Last Updated: November 24, 2018 (Refresh Now)
First Alert BRK SC 9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup
Last Updated: November 24, 2018 (Refresh Now)
8.8
SCORE
/10
Total Reviews
1000
Old Reviews
436
Unverified
61
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Review Analysis - 503 recent, verified reviews
Detailed Mode
Setup
86installed, install, installation, easy, builder
+98%
-2%
" ... This is my second purchase, replacing both of the existing ones as they expired at around 4 years from installation in a new property. ... "
" ... Install was a piece of cake (watched instructional vidio ). ... "
" ... Easy to install and working well so far! ... "
" ... Easy installation, hope I don't need to find out if it works!!. ... "
" ... Plug and play install. ... "
" ... Installed them in place of three SC6120Bs that were 14 years old. ... Easy to install. ... "
" ... Installed easy & tested well. ... "
" ... They are very easy to install when the existing wiring is already there. ... "
Product Reliability
865 years, units, detectors, smoke, chirping
+78%
-22%
" ... Replaced an old unit perfectly ... "
" ... I bought two of these because they are compatible with the smoke detectors that were installed on our remodel 15 years ago. ... "
" ... Some say they are only supposed to last 5 years, so I guess I was lucky. ... "
" ... Unplugged old ones, plugged in new ones and working perfectly. ... "
" ... Last ones operated flawlessly for over 5 years. ... "
" ... A few weeks ago, the unit started chirping. ... I am hoping that this unit will have a decent life span, but so far, I'm happy that it is functioning normally. ... "
" ... They work fine. ... "
" ... Worked great - just as advertised. ... "
Ease of Use
63easy, install, easy to replace, replace, smoke
+100%
" ... Easy change out. ... "
" ... Easy to install and working well so far! ... "
" ... Easy installation, hope I don't need to find out if it works!!. ... "
" ... Easy to install. ... "
" ... Easy as it can get ... "
" ... They are very easy to install when the existing wiring is already there. ... "
" ... easy to replace the bad one I had with this same model. ... "
" ... Very easy to install! ... "
Marketplace
33amazon, works as expected, works as advertised, exactly, advertised
+88%
-12%
" ... replacing the original ... "
" ... Product resolved the problem. ... "
" ... Works as expected ... "
" ... Ship as advertised . ... "
" ... Works fine and fit as expected. ... "
" ... works as advertised. ... "
" ... Works as expected. ... "
" ... Great quality as expected! ... "
Delivery
31fast, arrived on time, advertised, ordered, delivered
+87%
-13%
" ... Arrived on time. ... "
" ... Very fast delivery and excellent product ... "
" ... Arrived just as expected ... "
" ... Works well quick delivery ... "
" ... Came in timely manner. ... "
" ... Ship as advertised . ... "
" ... Fast shipping and works as advertised ... "
" ... Fast delivery, which was imperative. ... "
Fit
19exactly, right, perfectly, base, perfect
+100%
" ... Works great and perfect fit. ... "
" ... Fit perfectly and work exactly how you would hope. ... "
" ... Fits exactly as the one it replaced. ... "
" ... Works fine and fit as expected. ... "
" ... Perfect fit, works well ... "
" ... I had the older version and these fit right into the same base. ... "
" ... This fit into the same housing, and the hardwired connectors also matched. ... "
" ... Exact fit and didn't have to change out the base to mount. ... "
Capacity
18kitchen, smoke, bedrooms, apartment, years
+100%
" ... This is a replacement for house, First Alert provides dual function. ... "
" ... The unit matched my other 7 that I have in my house. ... "
" ... This was a replacement unit for the one already mounted in our apartment hallway. ... "
" ... Even in rooms other than the kitchen. ... "
" ... Have these throughout my house ... "
" ... Everyone should have one of these and a few of the one that measures the levels in each room . ... "
" ... I don't have much to say other than I needed a replacement for one that went out in my hallway. ... "
" ... Perfect for bedrooms. ... "
Price
18money, saved, prices, priced, best
+100%
" ... Excellent deal for the price. ... "
" ... A good value for the price. ... "
" ... Was everything I expected and price right ... "
" ... Product competitively priced ... "
" ... Extremely happy with the purchase and its price ... "
" ... Great buy for the price. ... "
" ... Priced these everywhere and couldn't find a better bargain. ... "
" ... I bought several from here and they all worked as expected and I got the best prices. ... "
Battery Life
18batteries, replacing, chirp, 9v, years
+67%
-33%
" ... The one battery backup smoke detector is all I need and it is a combination CO detector. ... "
" ... Yes, even after cleaning and with new batteries. ... "
" ... We check them regularly and change the batteries as needed. ... "
" ... Came with battery and everything. ... "
" ... Even came with 9V battery. ... "
" ... I like the fact that it has a battery backup in the event of a electrical failure. ... The unit is well made and easy to replace the battery or test. ... "
" ... They should last forever. ... "
" ... This is wired in with the rest of the smokes in the house, on home power and has a battery backup. ... "
Returns
17replace, return, replaced, model, unit
+53%
-47%
" ... I ordered another set for my new home. ... "
" ... I bought this to replace the exact same model. ... "
" ... Replaced my old one. ... "
" ... The good news is that it was easy to replace. ... "
" ... Nothing to review about this replacement. ... "
" ... Exact replacement, no hassle ... "
" ... Bought this as a replacement. ... "
" ... Replaced an exact model that was faulty. ... "
Product As Described
17works as expected, works as advertised, exactly, advertised, product
+94%
-6%
" ... Works as expected ... "
" ... Ship as advertised . ... "
" ... Works fine and fit as expected. ... "
" ... works as advertised. ... "
" ... Works as expected. ... "
" ... Great quality as expected! ... "
" ... Just as described. ... "
" ... Great worked as expected. ... "
Clock
12smoke, alarms, first alert, alarm goes, time
+50%
-50%
" ... Another issue is how to shut them off when they have a false alarm. ... "
" ... I was awoken to the alarm giving off chirps early in the morning. ... "
" ... I still get spurious beeps out of these alarms during occasional radio transmissions. ... "
" ... Should have been sent a new alarm ... "
Overall performance
10job, got, fast, far, looks
+100%
" ... Got it fast. ... "
" ... Works so far. ... "
" ... works just fine. ... "
" ... works very well. ... "
" ... works as advertised so far . ... "
" ... It does the job. ... "
" ... And we got it quick. ... "
" ... It is just what I wanted and it came real fast. ... "
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Specifications
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