# Kidde 5CO Carbon Monoxide Alarm and Detector with AA Batteries – 10 Year Sensor Life

Kidde 5CO CO alarm with AA batteries and 10-year sensor life. Simple, standalone protection for homes, evaluates status via LEDs and test/reset.

- [Original product page](https://www.ofertitastop.com/uk/product/kidde-5co-carbon-monoxide-alarm-and)
- Market: UK
- Language: en-GB
- Currency: GBP
- Product updated: 2026-10-08T06:24:37.314Z
- Brand: Kidde
- Model: 5CO
- MPN: 5CO
- EAN / GTIN: 0047871303496
- Category: Home & Garden > Flood, Fire & Gas Safety > Smoke & Carbon Monoxide Detectors > Carbon Monoxide Detectors
- Source store: amazon UK
- Active deal: Yes
- Price: 13.75 GBP
- Previous price: 18.95 GBP
- Rating: 4.7 / 5
- Reviews: 59535

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

## What it is and what it’s for
The Kidde 5CO is a battery-powered carbon monoxide alarm designed for home use. It operates on AA batteries and promises a sensor life of up to 10 years. It provides continuous CO monitoring with a dedicated end-of-life alarm to indicate when the device should be replaced. A test/reset button offers a straightforward way to verify functionality and reset the unit after a nuisance alarm. The unit uses multi-function green and red LEDs to communicate status and warnings. Importantly, it should not be considered a substitute for a smoke or fire alarm.

## How it works
Once installed in a suitable area of the home, the alarm continually monitors the air for carbon monoxide. If CO is detected, the red LED lights and a loud warning pattern sounds to alert occupants. The test/reset button allows quick verification of battery status and sensor function, while the green LED typically indicates normal operation. The device runs on AA batteries, meaning it does not require wiring or a separate power supply, which can be convenient for renters or homes undergoing renovations.

## What stands out
On paper, the 5CO’s 10-year sensor life is a meaningful feature for a safety device in a busy household. The battery operation simplifies installation and maintenance, avoiding the need for professional wiring or complex setup. The dedicated end-of-life alarm helps you plan for replacement rather than discovering a non-working unit after a critical event. The presence of both green and red LEDs provides a quick visual cue of status at a glance. The explicit warning that it is not a substitute for a smoke or fire alarm is important for setting realistic expectations.

## Potential drawbacks
A few practical caveats are worth noting. With a battery-powered unit, you’ll need to monitor battery life and replace batteries as needed, which can be a recurring cost and maintenance task. A CO alarm is only part of a comprehensive safety plan, it does not protect against fires and should be used alongside a dedicated smoke alarm in appropriate positions. If you prioritise a device with hard-wired power or interconnected alarms, this model may feel limited.

## Who it’s for
This Kidde model suits households seeking a low-maintenance, battery-powered CO detector that’s easy to install in a standalone position. It’s likely a good fit for renters, bedrooms, or living spaces where running electrical work is undesirable. It may also appeal to buyers who value a clear end-of-life alarm to plan replacement without guesswork.

## Who it’s not for
If you want a device that interconnects with other safety alarms or relies on fixed hard-wired power, this unit may not meet those needs. It might also fall short for users who expect a long-term, low-maintenance solution without any ongoing battery considerations.

## When buying makes sense
Consider this alarm if you want a straightforward, battery-operated CO detector with a long-sensor life claim and a visible end-of-life indicator. It’s sensible for additional CO protection in living rooms, hallways or near fuel-burning appliances. Before buying, check the location guidelines for CO detectors and ensure you place it in a spot that maximises response while complying with safety recommendations.

## Before you buy: what to check
- Verify the installation area complies with general CO alarm guidance and distance from potential CO sources.
- Confirm you’re comfortable with AA battery operation and periodic battery checks.
- Note the model’s explicit caveat about not replacing a smoke alarm, plan a combined safety setup accordingly.
- Consider how the end-of-life alert will be used to plan replacement rather than relying on guesswork.

## How it compares to other approaches
For a simple, standalone CO alert, this device offers a practical balance of ease of installation and maintenance. If you prioritise integration with other alarms or require a hard-wired option, you’d typically look at different setups. In homes where running power or networking isn’t feasible, a battery-powered unit like this provides a pragmatic solution that still meets essential safety needs.

## Practical usage example
You install the Kidde 5CO beside a kitchen or laundry area where fumes or combustion by-products might accumulate. It’s straightforward to test weekly using the button and to monitor green/red LED signals during the day. If a CO event occurs, you’ll hear the alarm and quickly identify the danger to evacuate and call for appropriate checks.

## Final verdict
Is it worth it? Worth considering if you want a simple, battery-powered CO alarm with a clear end-of-life signal and a one-piece maintenance approach. It’s a pragmatic choice for basic protection in areas where wiring isn’t practical. Not ideal if you need interconnection with other safety devices or a hard-wired solution. For many households prioritising straightforward safety without extra complexity, this model provides sensible value.

## FAQ
- How long does the sensor last? Up to 10 years according to the product description.
- Do I need to replace batteries? The unit runs on AA batteries and will require periodic battery checks and replacements.
- Can it replace a smoke alarm? No, it should not be used as a substitute for a smoke or fire alarm.

## Images

![Kidde 5CO Carbon Monoxide Alarm and Detector with AA Batteries – 10 Year Sensor Life — 1](https://www.ofertitastop.com/i/FCygUfck6kHxM59vdFCEvC8tar9kxJLzF2PfhE6UqnS8w_hjOzWxqSH6BVREHU8wlZ7IP1T_K1g6OIPNJOSngZO0hmDGUblLZBaZPaU3hnJxS-AJuVOiR_2j3A.jpg)

![Kidde 5CO Carbon Monoxide Alarm and Detector with AA Batteries – 10 Year Sensor Life — 2](https://www.ofertitastop.com/i/78Odw3G9-WePdfkBov0LG8GRrEhpCT7r0Uy8SVsoIBywp_oRL0I84OPwKlz1tb3R29hm7La1QirqZyfEH7-uOChXeM-k5iJj4ncLBp8fskmzIQeoIhRSJHRLng.jpg)

![Kidde 5CO Carbon Monoxide Alarm and Detector with AA Batteries – 10 Year Sensor Life — 3](https://www.ofertitastop.com/i/uOSYDEny9yjmJI31LTq3Hd5IBpvdCc-Jddyp6HM81CPPFsAkBDkw5OV2jKKN706UNZ8YQET5qpGzQKKWLo7nOV9vdRFL87ScfqffaNwZvY9MxY91IrT_NzL9gg.jpg)

![Kidde 5CO Carbon Monoxide Alarm and Detector with AA Batteries – 10 Year Sensor Life — 4](https://www.ofertitastop.com/i/AOrEc5YMUA0vHLE5bsJDpNgEU23OENlcMnJEsBbRQJCBhxBcp08M1FfJl6uiYBFUTL53SQv73WoKh3Mfcu37wQ1rG-mI1TzxQko8ctJR9dNFi_BWsRCqahnLnw.jpg)

![Kidde 5CO Carbon Monoxide Alarm and Detector with AA Batteries – 10 Year Sensor Life — 5](https://www.ofertitastop.com/i/SsCFDdnc_viPjn4KdJmRnz4OkMeiZF4tTI3rIMtQHpPjBvLM3I-m-zP30feZ39XW226UiofwNsRM74Cnib3besXlPsoisqeT77dJVuOd_BcAyCGcM6u-bkmkdg.jpg)