World's smallest CO alarm without light


£62.91 ex VAT

World’s smallest battery-powered carbon monoxide alarm. Designed to stay out of sight and give you complete peace of mind.

Fully fire-rated for total reassurance.

5-year product guarantee.

10-year sealed battery to keep spaces safe.

You'll only notice it when your life depends on it.

The world’s smallest battery-powered carbon monoxide alarm is designed to stay out of sight and silent until you need it most, constantly monitoring and measuring to keep everyone in your home safe and sound.


Battery type

Non-replaceable CR2 10-year battery

Battery life

Minimum 10-year life in normal operating conditions

Sensor life

10 years after manufacturing date

Operating temperature

+4ºC to +38 ºC (tested 0ºC to 55ºC)

Operating humidity

Up to 90% RH non-condensing


Audible indicator minimum 85dB @ 3 metres in anechoic successive tones


30/60/90 - Solid Joist 30 - Metal Webbed Joist & I-Joist

Product colour



Cut-out size








Important bits.

Here you can find all the information you need to achieve streamlined results.

Design files.

.RFA, .LDT, and .IES files to help streamline your design.


Every product detail on one useful, downloadable datasheet.

Install sheet.

Download the installation sheet for all our technical know-how.

Test certification.

All our official certifications, ready for you to download.


At Lumi-Plugin® we believe everybody deserves beauty and safety in their home.
We are proud of our almost non-existent failure rate which is why our carbon monoxide alarm comes with a 5-year guarantee.


  • What makes the One-CO alarm different?
    It’s the world’s smallest carbon monoxide alarm with a 10-year battery, designed to keep your home beautiful and safe.
  • Is the One-CO alarm as safe as ordinary carbon monoxide alarms?

    Yes. All our products including our carbon monoxide alarm are fully accredited and certified by third-party regulators to ensure peace of mind across your entire home. Our carbon monoxide alarm is more discreet but no less complete, making your space safe and stylish.

  • If the One-CO alarm fails do I have to replace the whole fixture?

    No. We’ve designed the product so you just replace the part you need. You can replace the CO alarm here. However, our carbon monoxide alarm has a 10-year life so you don’t need to worry about this for a while.

  • Where would I need a carbon monoxide alarm in my home?

    Carbon monoxide alarms are designed to protect you from the silent killer. Examples of risks in your home include but are not limited to… your boiler or log burner and more.

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