---
product_id: 35285178
title: "FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3"
brand: "first alert"
price: "Bs.1199"
currency: BOB
in_stock: true
reviews_count: 8
category: "First Alert"
url: https://www.desertcart.bo/products/35285178-first-alert-co400-3-carbon-monoxide-detector-battery-operated-white
store_origin: BO
region: Bolivia
---

# 85dB loud alarm for instant alerts Battery-powered for uninterrupted safety Advanced electrochemical CO sensor FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3

**Brand:** first alert
**Price:** Bs.1199
**Availability:** ✅ In Stock

## Summary

> 🏠 Stay safe, stay savvy — CO protection that’s always on, even when the power’s off!

## Quick Answers

- **What is this?** FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3 by first alert
- **How much does it cost?** Bs.1199 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/35285178-first-alert-co400-3-carbon-monoxide-detector-battery-operated-white)

## Best For

- first alert enthusiasts

## Why This Product

- Trusted first alert brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Hear It Loud & Clear:** An 85-decibel alarm ensures you never miss a critical CO alert, protecting your home and loved ones.
- • **Effortless Maintenance:** One-button test/silence and low battery alerts keep your safety system reliable without the headache.
- • **Unplugged Peace of Mind:** Battery-operated design means no wiring hassle and continuous monitoring—even during power outages.
- • **Precision Detection Tech:** Electrochemical sensors provide the most accurate CO detection, safeguarding every corner of your space.
- • **Strategic 3-Pack Coverage:** Place one on every level and bedroom for comprehensive, UL-tested protection tailored to your home’s layout.

## Overview

The FIRST ALERT CO400-3 is a 3-pack of battery-operated carbon monoxide detectors featuring advanced electrochemical sensors for precise CO detection. Each unit emits a loud 85-decibel alarm to alert you of dangerous CO levels, operates independently of home power, and includes user-friendly test/silence functions. Designed for easy placement on every home level and bedroom, these UL-listed alarms provide reliable, continuous protection with a 5-year sensor lifespan and low battery alerts, ensuring your family’s safety around the clock.

## Description

Product Description This handy 3-pack of FIRST ALERT CO400 Carbon Monoxide Alarms utilizes electrochemical carbon monoxide sensors to monitor your space for carbon monoxide threats. The battery-powered design doesn't require an electrician; simply insert the included 9-volt battery into each alarm, and the carbon monoxide detectors are ready to go. The advanced electrochemical CO sensors detect carbon monoxide leaks from multiple sources, such as faulty fuel-burning appliances, blocked chimneys, and generators running inside or too close to homes. When CO levels become elevated, a loud 85-decibel alarm alerts you to the threat. Because CO evenly distributes itself, it's important to have a CO detector on every level and in every bedroom of your home. Designed to be simple to use, each CO detector has just one button that silences or tests the unit, as well as an end-of-life timer that lets you know when it's time to replace the device. 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 it's 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 FIRST ALERT CO400-3 carbon monoxide alarm uses an electrochemical carbon monoxide sensor, the most accurate technology available. The permanent sensor lasts up to five years. It is powered by 1-9V replaceable battery per alarm giving you peace of mind even during power outages. The test/silence button both silences the alarm and allows you to test its functionality. 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. For use in all 50 states; compliant with current CO Laws in California, Wisconsin, and Oregon. UL listed. From the Manufacturer 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 it's 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 First Alert CO400-3 carbon monoxide alarm uses an electrochemical carbon monoxide sensor, the most accurate technology available. The permanent sensor lasts up to five years. It is powered by 1-9V replaceable battery per alarm giving you peace of mind even during power outages. The test/silence button both silences the alarm and allows you to test its functionality. 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. For use in all 50 states; compliant with current CO Laws in California, Wisconsin, and Oregon. 5 year limited warranty. UL listed.

Review: Great Carbon Monoxide Detector – Easy to Install and Reliable! - I bought two of the First Alert Carbon Monoxide Detectors (model CO400), and I’m very happy with them. They were super easy to install — no outlet needed since they run on batteries. I just mounted them on the wall, and they were ready to go in minutes.I like that the battery operation means I can place them anywhere in my home without worrying about finding a plug. The alarm is loud enough to hear clearly, and the design is compact and simple.It gives me peace of mind knowing my family is protected. Overall, great value, easy setup, and reliable safety product. Highly recommend!
Review: Awesome - Great product!!! Works very well

## Features

- Keep your family safe with this 3-Pack of easy to use, battery operated carbon monoxide alarms; battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure
- Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room
- A loud 85-decibel alarm sounds when CO levels reach dangerous levels
- To ensure complete protection make sure to place one on each level of your home and in each bedroom
- All First Alert CO alarms are rigorously tested to meet UL standards. Dimensions-3.4 x 1.5 x 5 inches

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Alarm | Audible, Visual |
| Brand | First Alert |
| Item Weight | 0.5 Pounds |
| Power Source | Battery Powered |
| Product Dimensions | 1.5"D x 5"W x 3.4"H |
| Style | Battery Powered |

## Images

![FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3 - Image 1](https://m.media-amazon.com/images/I/714ce2d8HEL.jpg)
![FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3 - Image 2](https://m.media-amazon.com/images/I/81mZkoZ1l7L.jpg)
![FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3 - Image 3](https://m.media-amazon.com/images/I/71+r+p5XTmL.jpg)
![FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3 - Image 4](https://m.media-amazon.com/images/I/7171-CAkUqL.jpg)
![FIRST ALERT CO400-3 Carbon Monoxide Detector, Battery Operated, White , 3-Pack -CO400-3 - Image 5](https://m.media-amazon.com/images/I/71+wvEJrMbL.jpg)

## Available Options

This product comes in different **Pattern, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Carbon Monoxide Detector – Easy to Install and Reliable!
*by S***N on November 12, 2025*

I bought two of the First Alert Carbon Monoxide Detectors (model CO400), and I’m very happy with them. They were super easy to install — no outlet needed since they run on batteries. I just mounted them on the wall, and they were ready to go in minutes.I like that the battery operation means I can place them anywhere in my home without worrying about finding a plug. The alarm is loud enough to hear clearly, and the design is compact and simple.It gives me peace of mind knowing my family is protected. Overall, great value, easy setup, and reliable safety product. Highly recommend!

### ⭐⭐⭐⭐⭐ Awesome
*by S***H on February 11, 2026*

Great product!!! Works very well

### ⭐⭐⭐⭐⭐ Peace of Mind
*by S***N on February 4, 2026*

Fair price, easy to set up and look good on the wall. It’s given me peace of mind during these colder months.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.bo/products/35285178-first-alert-co400-3-carbon-monoxide-detector-battery-operated-white](https://www.desertcart.bo/products/35285178-first-alert-co400-3-carbon-monoxide-detector-battery-operated-white)

---

*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-03-06*