First Alert

Model # SC0403

Internet # 204417668

Battery Powered Combination Pack Smoke and Carbon Monoxide Alarm with Low Battery Alert

$20.90 /each
  • Electrochemical carbon monoxide sensor
  • Ionization smoke sensing technology
  • Battery backup, batteries included

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Product Overview

The SC0403 is a combination pack of Carbon Monoxide (CO) and smoke alarm. This product can detect the CO you can't see, smell or taste in the air. The unit monitors and re-alarms if carbon monoxide levels persist sounding a loud 85dB horn. No installation is required and the attractive design allows the unit to be placed anywhere you need it. It includes an optional wall mount with no outlet required. An audible and visual low battery signal alerts you to replace the battery. Pull down action chart has convenient guide on what to do if an alarm sounds. No one wants to think about a fire in their home, but being prepared and recognizing signs of danger early can help keep you and your family alive and safe. The First Alert smoke alarm with silence button allows you to both silence a non-threatening alarm and to test the unit's functionality. It features a low battery alert to remind you when to change the battery and has a missing battery guard to ensure that a battery is placed inside the alarm. The side battery drawer slides open for easy battery replacement. A blinking power indicator on the unit confirms that it is receiving power.

  • Optional pin to lock the battery and unit in place for tamper resistance
  • Mounted on either the ceiling or the wall and can be used in mobile homes and RVs
  • Includes a 9-Volt battery
  • UL listed
  • Comes with a 5-year limited warranty



Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 


Alarm Sensor Type 
Alarm Type 
Carbon Monoxide 
Alarm/Detector Features 
No Additional Features 
Commercial / Residential 
Connector/Contact Type 
Power Source 
Voltage (volts) 

Warranty / Certifications

Certifications and Listings 
1-UL Listed 

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Customer Questions & Answers

1 Question0 Answers

Customer Questions & Answers

Battery Powered Combination Pack Smoke and Carbon Monoxide Alarm with Low Battery Alert
Battery Powered Combination Pack Smoke and Carbon Monoxide Alarm with Low Battery Alert

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how do you tell if it is smoke or carbon monoxide tripping the alarm with a combination battery product

This question is from Battery Powered Combination Pack Smoke and Carbon Monoxide Alarm with Low Battery Alert
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syracuse, ny
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September 5, 2015
I am looking at The First Alert battery operated combination smoke CO2 alarm
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Customer Reviews

Rated 4.5 out of 5 by 2 reviewers.
Rated 4.0 out of 5.0 by Not What I Expected But Still Good It appeared like one product online but was actually two products. Batteries need to be replaced every 6 to 12 months. This is, however, a reliable product that gets the job done. September 8, 2015
Rated 5.0 out of 5.0 by Smoke Alarms I can understand why they only make this offer online; however, it is unfortunate for those who do not have a computer to take advantage of this special price deal. Great price and brand name product. I am very satisfied. March 3, 2015
  • 2016-07-27 T13:24:50.643-05:00
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