(1298 customer reviews)

  • ✅PROTECTION FROM DEADLY THREATS: Protects against dangerous carbon monoxide (CO) in the surrounding air; accurately detects CO from any potential sources; designed to give you the earliest possible warning of CO threat with both a loud 85 dB alarm and a rapid flashing red LED indicator (the LED indicators won’t disturb your sleep while the alarm is in normal working status)
  • ✅BUILT-IN LITUMIT 10 YEARS BATTERY: A built-in 10-year lithium battery means you don’t need to worry about changing batteries during the lifetime of the alarm.and an end-of-life warning lets you know when it’s time to replace the alarm
  • ✅PORTABLE &EASY TO INSTALL : No need to worry about wires or wall outlets, our CO alarm is provided with screws and anchor plugs and Two stents, so it installs quickly and easily anywhere you want.
  • ✅TUV-BS EN 50291-1:2018 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 YEARS QUALITY ASSURANCE: Comes with a 60-day money-back guarantee and 10-year warranty with a response time of 24 hours.Even if the product has problems in the ninth year, we can replace it free of charge.

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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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