Silence mode how to set up? Pressing test button gives me alarm. What's the point then?

I don't think there is a set up procedure for silent mode. I think that after testing, when the alarm stops, the unit goes into silent mode for 5 minutes to reset itself and then starts monitoring again.

To Seller: What is the battery (lithium) expiry date printed on the box? Thank you.

I bought one of these about a month ago. I don't have the box anymore, but the printing on the unit says replace by 09/2034.

Can this be used outdoors for my patio heater ?

I wouldn't think so as if it's outdoors, any carbon monoxide would just disperse harmlessly in the air. It's only dangerous indoors.

Contact seller I bought two they arrived today one is very quiet the other perfect us this a fault? The other is perfect please devise

When I activated the test procedure the alarm volume increased and was fairly loud.

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FireAngel FA3820 Portable Carbon Monoxide Detector/Alarm, 10 Year Battery

FireAngel FA3820 Portable Carbon Monoxide Detector/Alarm, 10 Year Battery

Product ID: 470810555

Details

Alarm
Audible
Brand
Fireangel
Colour
White
Item weight
95 Grams
Material
Plastic
Power source
Battery

📏Compact 125x67x33 mm portable design

📢85 dB(A) loud audible alarm

🔋10-year sealed battery life

R1239

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay Ahead of the Silent Killer with FireAngel’s 10-Year CO Guardian! 🚨

DUAL ALERT SAFETY - Loud 85 dB chirps combined with a flashing red LED provide unmistakable audible and visual CO danger signals.
CERTIFIED TRUSTED - BSI Kitemark certified and UKCA marked, meeting rigorous British Standards for reliable home and rental safety.
TRAVEL READY COMPACTNESS - Lightweight and portable design fits perfectly in homes, caravans, and even on the go—never compromise on safety.
DECADE LONG PEACE OF MIND - Tamper-proof 10-year sealed battery ensures uninterrupted CO protection without the hassle of replacements.
SMART EARLY WARNING SYSTEM - High sensitivity mode triggers pre-alarms at 180 ppm CO levels, giving you crucial extra seconds to ventilate and act.

The FireAngel FA3820 Portable Carbon Monoxide Detector features advanced electrochemical sensing technology with a tamper-proof 10-year sealed battery, delivering reliable, long-lasting protection. Its compact, travel-friendly design and dual alert system (audible 85 dB alarm plus flashing LED) ensure you’re warned early of dangerous CO levels. Certified to the highest UK safety standards, this device offers smart pre-alarm warnings and alarm memory, making it an essential, trusted safeguard for homes, rentals, and mobile living spaces.

Specifications

ASIN	B0B9HC17ZG
Alarm	Audible
Best Sellers Rank	238 in DIY & Tools ( See Top 100 in DIY & Tools ) 4 in Carbon Monoxide Detectors
Brand	Fireangel
Colour	White
Country of Origin	China
Customer Reviews	4.6 out of 5 stars 3,410 Reviews
Included Components	1 x Carbon Monoxide Detector (with sealed battery), 1 x Manual
Item Dimensions D x W x H	3.3D x 12.5W x 6.7H centimetres
Item Highlight	1-Pack, 10-Year Sealed Battery Carbon Monoxide Alarm for Home & Travel, CO Alarm Monitor for Caravans, Campervans & Cars
Item Type Name	Carbon Monoxide Alarm
Item Weight	95 Grams
Item weight	95 Grams
Manufacturer	FireAngel
Manufacturer Contact Information	FireAngel Safety Technology Limited, Vanguard Centre Coventry, CV4 7EZ, UK.
Manufacturer Warranty Description	5 year manufacturer's warranty.
Material	Plastic
Model Number	FA3820
Number of Items	1
Part Number	FA3820
Power source	Battery Powered
Product Style	Single
Product dimensions	3.3D x 12.5W x 6.7H centimetres
Sensor Type	Electrochemical
Style	Single
UPC	816317006020
Unit Count	1.0 count

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R1239

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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