Black+Decker Carbon Monoxide Detector 2 Pack with 10 Year Sealed Lithium Battery (Easy to install)
Product description
The essentials
A carbon monoxide (CO) alarm is one of those home safety items you really don’t want to think about until you need it. This Black+Decker Carbon Monoxide Detector 2 Pack is designed to do exactly that: detect dangerous CO levels, then make sure you notice with loud chirps and a flashing red LED. It’s also built around a 10 year sealed lithium battery, so you’re not juggling frequent battery changes.
You get two units, which is handy if you’re fitting more than one area (for example, where different rooms connect to living spaces and sleeping areas). No wiring is required, so the install is more “place and secure” than “call someone out”. That matters if you want to get this done promptly rather than dragging it into the long to-do list.
What you’ll notice in use
On detection, the alarm uses 4 loud 85dB(a) chirps at 3 metres along with a flashing red LED. In other words, it’s not just a subtle indicator—you should hear it and see it clearly when something needs your attention.
There’s also an alarm memory behaviour: if the CO alarm activates while you’re away, it continues to alert until levels are safe. After activation, the red indicator continues to flash once every 4 seconds for 72 hours, so it’s easier to confirm that it did trigger—even after conditions improve.
One small practical detail: the set-up guide mentions a chirp and red LED flash sequence when you slide the unit onto the activation base plate, and a test button process that affects when the alarm sounds. It’s straightforward, but it does mean you need to follow the steps rather than just mounting and assuming everything checks out.
Key points
This two-pack CO alarm is built for everyday home safety with a straightforward installation method: slide onto the activation base plate and you can fix it to a wall or leave it free-standing. The battery is sealed and tamper resistant, and the alarm is designed to indicate when replacement is needed, rather than leaving you guessing.
For compliance-minded buyers, it’s stated as certified to BS EN 50291-1:2018 and BS EN 50291-2:2019, and fully compliant with CE and UKCA standards. That doesn’t automatically make every home setup perfect, but it does give reassurance that it’s been built around the relevant standards.
It’s also worth noting that this model is electrochemical sensor based (as described). That’s generally the kind of sensing approach you’d expect from a dedicated CO alarm, not a “multi-sensor” device trying to cover everything at once.
Tech specs
- Type: Carbon monoxide alarm
- Sensor: Electrochemical sensor
- Battery type: Sealed, tamper-proof lithium battery
- Battery life: 10 year
- Alarm sound: 4 loud chirps at 85dB(a) (at 3 metres)
- Alarm indicator: Flashing red LED
- Alarm memory: Red indicator flashes once every 4 seconds for 72 hours after activation
- Certification: BS EN 50291-1:2018 and BS EN 50291-2:2019
- Standards compliance: CE and UKCA
- Installation: No wiring required, fixed to a wall or free standing using activation base plate
Where it shines (and where it may not)
It’s a solid fit if you want a no-wiring CO alarm with long-life power (10 year sealed lithium) and clear alarm signalling (sound plus flashing LED). The two-pack format can be particularly useful if your home has more than one key risk zone, or if you’re updating older units without tackling installation complexity.
However, it may not be the right choice if you specifically need something beyond a basic CO alert—this description focuses on CO detection and the alarm behaviour, but doesn’t mention smart connectivity, app support, or integration with other devices. If your priority is “bells and whistles” rather than reliable stand-alone detection, you may find this keeps things more simple than you’d like.
Also, as with any CO alarm, placement and household layout matter. The alarm is designed to be heard at a given distance (3 metres is mentioned), but real homes vary—so it’s worth thinking carefully about where you mount or place each unit.
Who it’s for
This is for households that want a straightforward carbon monoxide alarm solution that’s easy to install and built to run for years on a sealed battery. If you’re fitting for peace of mind in a typical UK home—especially where you’re relying on gas appliances or have any combustion risk—having two detectors can help you cover more of your day-to-day spaces.
It might be less appealing if you’re looking for a high-tech system that talks to other sensors or offers remote alerts. Based on the information available, this is a stand-alone detector, not a “system”.
Should you buy it?
Buy it if you want two electrochemical CO alarms with loud 85dB(a) chirps, a flashing red LED, 10 year sealed lithium battery life, and an easy install that requires no wiring. The compliance to BS EN standards and CE/UKCA markings is also a sensible tick if you prefer products that are built for the regulatory baseline.
Skip it (or at least think twice) if you need smart features, remote notifications, or integration with home systems—nothing in the details suggests that. And don’t treat the installation as completely “hands off”: the activation base plate and testing steps matter, so it’s worth following the guide so you know the units are working.
Mini FAQ: - How does the alarm signal a CO detection? It uses 4 loud chirps (85dB(a) at 3 metres) and a flashing red LED. - Does it need wiring? No wiring is required, it uses an activation base plate and can be wall mounted or free-standing. - What about the battery—can I replace it? The battery is described as a sealed, tamper-proof 10 year lithium battery, and the alarm indicates when replacement is needed. - Will it stop once CO levels drop? The alarm continues to alert until there are safe levels, and the red indicator continues flashing for 72 hours after activation. - Is it certified for UK/EU markets? It’s stated to be certified to BS EN 50291-1:2018 and BS EN 50291-2:2019 and compliant with CE and UKCA.