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First Alert SCO403 Alarm Combination Pack

4.2 out of 5 stars 132 customer reviews
| 5 answered questions

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  • Includes battery-operated carbon monoxide alarm and battery-operated smoke alarm
  • Modern, compact CO detector design with no installation required, electrochemical sensor
  • Smoke alarm uses ionization smoke sensing technology
  • Simple to use silence/test button, low battery warning, end-of-life timer, 85 decibel alarm
  • Two 9V batteries included, 5-year limited warranty
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Product Description

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From the Manufacturer

The SC0403 is a combination pack of Carbon Monoxide (CO) and smoke alarm. Carbon monoxide (CO) is the leading cause of accidental poisoning deaths in America, yet many people don't know they are suffering from CO poisoning until its too late. Since symptoms of CO poisoning are like the flu, you might not even know you're in danger at first. That's why a carbon monoxide alarm is an excellent way to protect your family. It 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 85-Decibel 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. The alarm contains an optional pin to lock the battery and unit in place for tamper resistance. It can be mounted on either the ceiling or the wall and can be used in mobile homes and RVs. It includes one 9-Volt battery and has a 5-Year limited warranty. UL listed for safety

Product Information

Product Packaging:Standard Packaging

Technical Details

Part Number SCO403
Item Weight 13.6 ounces
Product Dimensions 9.8 x 3.5 x 6.9 inches
Item model number SCO403
Color White
Material computer
Power Source battery-powered
Item Package Quantity 1
Number Of Pieces 1
Batteries Included? Yes
Batteries Required? Yes
Warranty Description 5-Year

Technical Specification

Additional Information

ASIN B002GP7D02
Customer Reviews
4.2 out of 5 stars 132 customer reviews

4.2 out of 5 stars
Best Sellers Rank #143,155 in Home Improvements (See top 100)
#728 in Home Improvement > Safety & Security > Home Security & Surveillance > Security Sensors
#9,029 in Electronics > Office Electronics
Shipping Weight 13.6 ounces
Domestic Shipping This item is available for shipping in the U.S. except for California and to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available July 30, 2009

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Customer Reviews

Top Customer Reviews

Package Type: Standard Packaging Verified Purchase
I was skeptical about the price of this combo unit, but after seeing them both do their job flawlessly, I am VERY impressed. The smoke detector is VERY sensitive, which I like (especially with a woodstove) and the CO2 detector probably saved my life and my dog. During our 2foot snowstorm last year, we lost power and were running a generator. My neighbor decided to fill up the unit and then repositioning the generator so that the exhaust pointed in the house. The when it went off imediately allerted me that there was a CO2 issue and advised me to go to a window for oxygen. One my best purchases yet!
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These two alarms, the smoke detector and the carbon monoxide detector, were a very good product for a very good price, compared to the local stores, a great price for the quality.
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First Alert is known as a major brand in the industry. Upon seeing a design flaw and instructional error on the carbon monoxide detector, I now question their competence.

1. The CO detector must be installed sideways for the battery to make contact with the terminals. There is no way to lock the battery in place. Instead, you have to mount it in such a way that gravity keeps it in place. If you have limited vertical space or would like to ceiling-mount it, DO NOT BUY THIS PRODUCT. Luckily, I had the space to mount it sideways.

2. The instructions for the CO detector include a mounting template, with the holes spaced 64 mm apart. "2.5 inches (64 mm)" is actually printed on the template as well. In fact, the screws on the unit must be mounted 92 mm apart. That's roughly a 3 cm difference, while the entire width of the unit is only 12 cm (or would that actually be the height, since it must be mounted sideways?).

Granted, these are two seemingly mild one-time annoyances experienced during the installation of this product, but the manufacturer actually paid someone to design the unit with the battery flaw, and actually paid someone to illustrate the wrong template in the instructions. Now I'm expected to trust my home, my life, and my family's lives to the other employees this same manufacturer paid to ensure the thing actually detects carbon monoxide properly and alerts people properly.

You wouldn't expect to have an uneasy feeling upon installing a brand new detector with a brand new battery.
2 Comments 15 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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These units are nice looking, easy to mount, and are small and compact; but hard to figure out, and hard to install the battery.
The following is an update as of Jan 17, 2014,,,,,,Both of these units started chirping continuously. Chirping indicates a low battery. At first I merely installed new batteries; but after more chirping, I decided to check the batteries with my voltmeter to see if the new batteries were low. (As a technical analyst I happen to have meters in my workshop). The batteries were not low. Also there is no smoke, carbon monoxide or smell problems in my house. They even chirped outside in the yard. I am no longer using these units, and the warranty has run out. I will be looking for a slightly larger different brand unit which may make it easier to install a battery.
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I bought this item for someone else and the 2nd day after being up the carbon one started chirping and it needed a battery. It was sold with batteries thinking good complete when I sent it to them, but either sell w/out battery or please send newer ones. Otherwise the products are fine.
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The battery installation on both units is faulty. On the Smoke Alarm you have to lay the battery in a compartment and close the door - it fits loosely and doesn't connect completely. I spent 30 minutes trying to install the battery in the Carbon Monoxide - you actually laid the battery in a plastic "hole", then just closed the door on it. I never got it to even come close to connecting. I will not trust my life to these two faulty products. Thank goodness for Amazon's easy return program!
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Regarding the CO400 Carbon Monoxide Alarm. The battery compartment is non-functional. I don't know how First Alert thought this would work.
The model I received take a 9v battery. There is a plastic tab on the battery cover that is supposed to keep the battery pressed up against the terminals. But, there is too much space. So, when you close the door, the battery doesn't make contact with the terminals, and so the unit doesn't work at all.
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I believe it is a necessity to have both a smoke alarm and a CO2 detector. I have a pellet stove and have a set near it. I also have a set downstairs near my heater. My heater man said not too close just in same room. Saving a life seems to make this a small price to pay.
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