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120VAC Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup

  • 120VAC Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup
First Alert Dual Sensing Smoke Alarm 3120B

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Photoelectric and Ionization Smoke Alarm with Battery Backup


This Hardwired Photoelectric and Ionization smoke alarm provides double protection for both flaming and smoldering fires. The 3120B smoke detector is a state-of-the-art hardwired alarm with a battery backup that features dual photoelectric and ionization smoke sensing technologies. This alarm includes two latching features. One alarm latch easily identifies an initiating alarm even after alarm condition has subsided. the second is a low battery latch that identifies which unit is in low battery condition by blinking the green power light. This alarm also has two silence features that includes a low battery silence that temporarily silences the low battery chirp for up to eight hours. Other features include an 85dB horn, single button test/silence, an easy access battery drawer and dust cover. Installation is quick, easy and cost effective. Connection to AC power is made with a Quick-Connect wiring harness.

First Alert Smoke Alarm 3120B

Photoelectric and Ionization Smoke Alarm with Battery Backup Features:

  • Utilizes both ionization and photoelectric smoke sensors for maximum protection.
  • Two Latching Features - Alarm Latch and Low Battery Latch.
  • Two Silence Features - Alarm Silence and Low Battery Silence.
  • Two AA Battery Backup.
  • Optipath 360 Technology.
  • 10-Years Limited Warranty.
  • Emits T3 Pattern.

Ionization smoke alarms are more sensitive at sensing small particles, which tend to be produced in greater amounts by hot, flaming fires, that are consuming combustible materials rapidly and may spread quickly.


Photoelectric smoke alarms are generally more sensitive at sensing large smoke particles, which tend to be produced in greater amounts by smoldering fires, which may smolder for hours before bursting into flame.


For maximum protection and full coverage from all types of fires, your best option is to use an smoke alarm that features both photoelectric and ionization sensing technologies.

Click Here to Write a Review for this Product. Review

Average Customer Rating Based on 15 reviews: Rating: 4.93333333333333/5Rating: 4.93333333333333/5Rating: 4.93333333333333/5Rating: 4.93333333333333/5Rating: 4.93333333333333/5

Rating: 4/5Rating: 4/5Rating: 4/5Rating: 4/5Rating: 4/5 - 02/02/2017
Reviewer: Asa Crane
I am replacing cheap and the installation was simple to carry over. No false alarms, which was problem with cheap.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Smoke Detector - 01/26/2017
Reviewer: Paul Silverman
Easy to install and looks good. Works well with first alert co/smoke detectors already in the house.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 dual sensing - 10/21/2016
Reviewer: Daniel Zerby
After seeing some research about smoke detectors. Our business highly recommends dual sensing units over the low price Ionization to help my family and our customers feel safer.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 BRK Hardwired Smoke Alarm - 09/14/2016
Reviewer: Nicholas Steiner
Excellent replacement for my Mother's Ten-Tek Electronics Model IL-930, Ionization Smoke Detector. Apparently Ten-Tek is out-of-business. Now I have a hardwired Smoke Detector which will detect both Photoelectric and Ionization fires.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Very Happy - 05/31/2016
Reviewer: Mary Nelson
We needed to replace our 3 smoke alarms so I contacted you. They came pretty fast & out daughter's boyfriend put them up. Only problem one of the alarms needed different batteries, so I suppose the other 2 will follow. Thank you.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 10/09/2015
Reviewer: Len Gregg
Good item where fire and smoldering is a risk. I placed this one in an area of my stair well. This item seems to have a longer delay when testing with the interconnect hardwired. Would have liked it to have co. as well.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 120VAC Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup - 09/30/2015
Reviewer: Thomas Woosnam
I have now received 3 of these smoke detectors and I am very pleased with the site and my ability to find stuff. I am also pleased with the shipping process: information and speed. One of my three is in use and works well. I will install the other two in the next several days. The install of # 1 was easy. I feel safe with these products. I recommend you use 1st Alert store and this smoke detection product. Tom W.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 08/27/2015
Reviewer: Daniel Zerby
This is the only unit that we install into customers homes. We are dba Integrity Electric in western Colorado.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Quality Product - 05/15/2015
Reviewer: Bob Toth
Replaced my alarms after 10 years and this unit was easy to install. Battery drawer was a tad tough to open but got it done. Seems to be a well constructed unit.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Good product - 10/24/2014
Reviewer: Charles Hinton
Good for all types of smoke


Read All Reviews
Q: What is the proper placement of smoke alarms?
A: It is important that you have the proper placement for your smoke alarms. Install your alarms at least 20 feet from appliances like furnaces and ovens, which produce combustion particles. Alarms should be at least 10 feet from high humidity areas like showers and laundry rooms, and at least 3 feet from heat/AC vents. Be sure to install a smoke alarm in each bedroom, one at the top of each stairwell, and one on every level.

Q: My smoke alarm keeps chirping and beeping. Why does my smoke alarm chirp intermittently?
A: It is likely that the reason your smoke alarm keeps chirping and beeping is that the battery is low. Whenever your smoke alarm keeps chirping, replace the battery immediately.

Other reasons include: It could be a different device or appliance such as a security system, monitor, carbon monoxide alarm, or other device which has a similar low battery or alert signal. Some of the same factors that cause unwanted alarms can cause intermittent alarms: dust and insects in the alarm or power interruptions in hardwired alarms. Improper wiring on AC or AC/DC smoke alarms. AC alarms will chirp every 5 seconds if the interconnect wire is grounded. The orange interconnect wire should NEVER be grounded; it should only be used to interconnect other smoke alarms or compatible devices.


Q: Why doesn't my smoke alarm sound when I push the test button?
A: It is important that you frequently test your smoke alarms. When you are testing your smoke alarm, there are a number of reasons why the alarm might not sound:
  • You may not be holding the test button down long enough. Try holding it down for up to 10 seconds (20 seconds on photoelectric models) .
  • Your battery may not be installed properly or snapped all the way in place. Even if the alarm sounded briefly when the battery touched the terminals, you still need to make sure it is snapped securely in place. If the battery is loose, in cannot power the smoke alarm properly. After installing new batteries, be sure to test your smoke detector.
  • Your AC power may not be on. AC and AC/DC units will have a power indicator light (red or green) that shines continuously when they are receiving electrical power.
  • If you have a 10-Year model, the smoke alarm may not have been properly activated. If the tab broke away before the alarm was activated, you can use a toothpick to move the switch over to test the alarm.

Q: Why does my smoke alarm go off when I install a battery or turn on the AC power?
A: It is normal for smoke alarms to go off and sound briefly (up to 5-10 seconds) when you install a new battery or when they are powered up. If the alarm continues to go off and no smoke is present, the cause may be one of the following:
  • There may be insufficient battery power, try new batteries.
  • Problems with voltage or insufficient electrical power (brown out) may cause a continuous weak sounding alarm. For AC or AC/DC models, temporarily disconnect power at the service panel until the brown out is over. If you do not restore the AC power, your smoke alarms cannot warn you of a fire.
  • Incompatible warning device. If an incompatible alarm or auxiliary device is linked into a series of AC or AC/DC smoke alarms it may cause the system inadvertently go off.

Q: My smoke alarm keeps chirping, even with a new battery. What is causing this?
A: There are a number of possible causes for your smoke alarm to keep chirping even with a new battery.
  • It is possible that your smoke alarm "silence" button was pushed by mistake. The alarm will now "chirp" once a minute for up to 15 minutes before resetting.
  • Are you sure it's the smoke alarm? Funny to ask, but other devices have similar low battery chirps or warning tones.
  • Your "new" batteries may not be fresh. If batteries are stored, especially in cold areas like refrigerators, they lose their charge more quickly. Always check the freshness date on the package when buying new batteries. Keep plenty of replacement batteries on hand so that you are sure to always be protected by your smoke alarms.

Q: I lost my First Alert smoke alarm owner's manual. How can I get a new one?
A: First Alert smoke alarm owner's manuals are available online for download at no cost. Find your alarm in our Smoke Alarms section.

Q: Why does the National Fire Protection Association (NFPA) recommend that home smoke alarms be replaced after 10 years?
A: Smoke alarms have a limited life. Although each smoke alarm and all of its parts have passed many stringent tests and are designed to be as reliable as possible, any of these parts could fail over time. Therefore, you must test the devices weekly. The unit should be replaced immediately if it is not operating properly. The performance of smoke alarms older than 10 years is simply not reliable. To ensure your family's safety, all carbon monoxide and smoke/CO combination alarms need to be replaced every 5-7 years. All smoke alarms need to be replaced every 10 years.

If it's time to replace your alarms, consider the NEW 10-Year Life series and never have to worry about a battery replacement for the life of the alarm.10-Year alarms are available in smoke,carbon monoxide and combination alarms.


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