First Alert CO5120BN Hardwired CO Alarm 2 Pack
- Hardwired with battery backup
- Electrochemical CO sensor
- 2 alarms per pack
- 9.28 oz listed weight
Updated 22 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A two pack of hardwired carbon monoxide alarms with battery backup for homes with existing alarm wiring. The listing gives almost no detail on voltage, interconnect or warranty.
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ASIN: B00E5S00EOModel: CO5120BNCategory: Carbon Monoxide Detectors
Overview
Homeowners replacing hardwired CO alarms get two electrochemical units that run on house power with a battery backup for outages. Each one wires into an existing alarm circuit.
Battery backup means protection continues through power cuts, and the pack covers two locations. The listing omits voltage, interconnect support, battery type and warranty, all worth checking before swapping existing units.
Who it's for
Homes already wired for alarms that need new CO units. Renters or homes without wiring should look at plug in or battery only alarms.
Pros and cons
- Two alarms in the pack
- Battery backup in outages
- Hardwired, no battery only reliance
- Voltage not listed
- Interconnect not stated
- Warranty not given
- Backup battery type unknown
Performance notes
Detection uses an electrochemical cell that reacts to CO concentration. Mains power runs it day to day, and the backup battery takes over when power fails.
Specifications
| Brand | First Alert |
|---|---|
| Model | CO5120BN |
| Dimensions & fit | |
| Item weight | 9.28 ounces |
| Power & efficiency | |
| Power Source | Hardwired with battery backup |
| Included components | |
| Unit Count | 2 |
| Other details | |
| Sensor Type | Electrochemical |
| Alarm | Carbon monoxide |
| Product Style | Modern |
Frequently asked questions
How do I install the First Alert CO5120BN?
It is hardwired to household power with a battery backup. The listing does not give wiring details, so follow the manual or use an electrician.
Does the First Alert CO5120BN detect smoke?
No. It is a carbon monoxide alarm only.
Will the First Alert CO5120BN work during a power cut?
Yes, it has a battery backup.
How many alarms come in the First Alert CO5120BN pack?
Two.