First Alert Hardwired Smoke Alarm with Battery Backup – 48 pack

9120B-48B-Hardwired_Smoke_Alarm_with_Battery_Backup_48_pack_bulk_packedBy: Safety Lab

The contractor pack of hardwired smoke alarms with battery backup isn’t just for new construction it is a perfect fit for apartment complexes, fire departments and other organizations. This bulk smoke detector comes in a convenient 48 pack that includes individual packaging, a battery and a manual for each alarm. Unlike a photoelectric smoke alarm, that detects smoldering fires, this ionization smoke alarm will detect rapid fast-moving fires by measuring particles in the air.  By simply connecting them to the pre-existing orange wiring at the time of installation this alarm is interconnected and will warn you of a fire in another area of your home. Some convenient features include the battery backup that will keep your alarm functioning as normal during a power outage and the optional locking feature that will help discourage unauthorized removal of the battery and/or actual alarm.

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2 Responses to “First Alert Hardwired Smoke Alarm with Battery Backup – 48 pack”


  1. 1 Chris O. October 25, 2009 at 11:12 pm

    I am trying to install a single unit now. Nothing in the paperwork indicates how the battery should be inserted (terminals first, positive on one side, negative on other, etc). And, the terminals don’t appear to connect to anything inside the detector regardless of how the battery is inserted. Could someone provide some info on this? I need to know or I need to get another product that is more intuitive.

  2. 2 Aida November 29, 2009 at 6:44 pm

    Hello. I am having the same problem. I put the replacement battery back in exactly as the one that was previously in with the terminals downward, but I did not know the negative or positive position. If you figure that out, please let me know. Thanks.


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