(1298 customer reviews)

  • MEET THE LATEST EN 50291-1:2018 – Our products are updated closely according to The -Smoke and Carbon Monoxide Alarm (England) Regulations 2015, label with the :document code “EN 50291:2018” released by TUV. It is important for you to make sure your CO alarm is labeled with the latest code, not only for your own properties but also commercial and residential tenancy.
  • BUILT-IN 10-YEAR LITHIUM BATTERY – A lithium battery comes with the CO alarm that operates for 10 years. No more low battery chirps go off in the midnight. No battery replacement is required but simply replace the whole CO alarm at the end of 10 years when low battery chirp is off. Our product has 10-year life-time warranty for your peace of mind.

  •  SMALL & PORTABLE – The CO alarm is 7 X 7 cm, even smaller than a human hand. The neat and stylish look blends naturally into any room of your home. As there is a built-in battery, no hard wire work is requirement. Simply hang it on anywhere you need, such as home, offices, RVs and camp sites. Our CO alarm will be a trusted device to guard your health and safety.

  • DIGITAL DISPLAY & INDICATOR LIGHT – The digital display screen shows the real-time CO level in the environment. The three indicator lights show you the current functioning of the CO alarm: the green light flashing slowly means the CO alarm works properly; the yellow light means an error/fault; the red light warns you the CO level is above the normal level. The warning chirp is as loud as 85dB.

  • INDOOR & OUTDOOR USE – Our portable lithium battery CO alarm is suitable for indoor and outdoor use. It is accurate and durable. It is small and light to be carried around. You can use it at home, in your office, in your tent and RV, and wherever the CO level might be a concern.


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10-year Extendable


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Why do we need to use carbon monoxidemonitor(CO monitor)? What is the risk of carbon monoxide?

  • Carbon monoxide (CO) is the leading causeof accidental poisoning deaths in America.
  • It’s commonly too late to find out they aresuffering from CO poisoning for many family.
  • Since the symptoms of CO poisoning are likethe flu, you might not even know you're in a danger at first.
  • Mount a carbon monoxide detector is anexcellent way to protect your family. It can detect the CO you can't see, smellor taste in the air.

The Small Machine That Makes
All The Big Differences


LCD display-Clearly displays the real-time CO levels in PPM taken from the surrounding air.


A screwdriver is all that is required for installation; no professional knowledge is required.

TÜV Approved

2018 The alarm has been third party approved through the British Standards Institute (BSI) and is Kitemark certified, The standard supersedes EN 50291-1:2010.

10-Year Battery Life

With a sealed, long-life lithium battery, you can enjoy peace of mind knowing that the carbon monoxide alarm in your home will be running 24/7 for 10 years.


  • Brand: WOLF SHIELD
  • Model: ‎BJ-828B
  • Color: Black / White
  • Material: ABS
  • Voltage: ‎3 Volts
  • Power Source: ‎Battery Powered
  • Battery Cell Type : ‎Lithium Polymer
  • Installation method: Wall-Mounted


  • Product Weight: ‎76 g
  • Package Weight: 5.0kg 
  • Product Size: 7 x 7 x 2 cm; 76 Grams

Package includes

  • 1x Manual
  • 2x Screws
  • 1 x Mounting bracket
  • 2 x Anchor plugs
  • 1 x CO alarm



Protecting your family from danger

No Hard Wire

Battery-powered to allow the unit to remain functional in the event of a power cut.

Faster Response to CO Levels

This detector is equipped with an electrochemical CO sensor to provide instant alerts to CO levels, keeping your family safe and sound.

3 Led Indicators

This alarm uses a multi-color LED indicator (red, green, yellow) combined with an audible alarm tone, making it easy for you to determine the alarm status.


People are extremely satisfied with Wolf Shield!

Wolf Shield specializes in designing and manufacturing reliable home safety products that protect people around the world. Our mission is simple — we want to keep every family and their property safe every second of every day.

Customer reviews


Questions & Answers

How long does it take to deliver an order?

Affected by Covid-19, there will be some delay on the delivery.

Because of the coronavirus and outrageous demand of the order processing can take up to

Can I inspect the goods upon receiving them?

Yes, you can open the parcel to view the product when you receive the order.

What should I do if there is a problem with my product?

Please notify our customer service about your problem and send the product back for repair or replacement.

What payment methods do you provide?

We accept PayPal.

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