--- product_id: 470810555 title: "FA3820 Sealed Battery Carbon Monoxide Alarm" brand: "fireangel" price: "£34.26" currency: GBP in_stock: true category: "Fire Angel" url: https://www.desertcart.co.uk/products/470810555-fa3820-sealed-battery-carbon-monoxide-alarm store_origin: GB region: United Kingdom --- # Compact 125x67x33 mm portable design 85 dB(A) loud audible alarm 10-year sealed battery life FA3820 Sealed Battery Carbon Monoxide Alarm **Brand:** fireangel **Price:** £34.26 **Availability:** ✅ In Stock ## Summary > 🔥 Stay Ahead of the Silent Killer with FireAngel’s 10-Year CO Guardian! 🚨 ## Quick Answers - **What is this?** FA3820 Sealed Battery Carbon Monoxide Alarm by fireangel - **How much does it cost?** £34.26 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/470810555-fa3820-sealed-battery-carbon-monoxide-alarm) ## Best For - fireangel enthusiasts ## Why This Product - Trusted fireangel brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **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. ## Overview 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. ## Description From the brand Shop Smoke Alarms Visit the store Shop Smoke Alarms Visit the store Shop Carbon Monoxide Alarms Visit the store Shop Carbon Monoxide Alarms Shop Heat Alarms Visit the store Shop Heat Alarms Shop Pro Connected Alarms Visit the store Shop Pro Connected Alarms ## Features - CARBON MONOXIDE ALARMS FOR HOME USE: The advanced electrochemical sensor detects dangerous levels of carbon monoxide (CO) in your home, alerting you with 4 loud chirps (85 dB(A) at 3 metres) and a flashing red ‘CO’ LED light. - ENHANCED SENSING: The alarm’s high sensitivity mode will activate if it predicts that CO levels will rise to or above 180 ppm, providing a quicker alert and a ‘pre alarm’ with a visual instruction to ‘ventilate'. - 10-YEAR SEALED FOR LIFE BATTERY: Each CO monitor is fitted with a sealed, tamper proof, 10 year battery that will last the lifetime of the alarm. A flashing amber '!' and an audible beep will alert you when the device needs replacing. - ALARM MEMORY: Your device will notify you of a CO alarm in your absence. If not silenced, the alarm will continue to sound until CO levels are safe. The red ‘CO’ light will continue flashing as a visual indication of a previous activation. - PORTABLE CARBON MONOXIDE DETECTOR: Measuring 125 x 67 x 33 mm, this compact, free standing device is travel friendly and provides protection wherever you go. It also includes an integrated mounting bracket and screws for easy wall mounting. - SAFETY ASSURED: Suitable for all domestic and rental premises, the FA3820 carbon monoxide monitor is UKCA marked, Kitemark certified, and third-party approved by the British Standards Institute (BSI) to BS EN 50291-1:2018 and EN 50291-2:2019. - FIREANGEL HOME PROTECTION: In addition to our carbon monoxide detectors, we offer a wide range of other safety products designed to protect you and your family. Choose from smart and wireless devices, as well as standard fire, smoke, and heat alarms. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0B9HC17ZG | | Alarm | Audible | | Best Sellers Rank | 167 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 4.6 out of 5 stars (3,451) | | 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 | | 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 | | Sensor Type | Electrochemical | | UPC | 816317006020 | | Unit Count | 1.0 count | ## Product Details - **Alarm:** Audible - **Brand:** FireAngel - **Colour:** White - **Item weight:** 95 Grams - **Material:** Plastic - **Power source:** Battery Powered - **Product dimensions:** 3.3D x 12.5W x 6.7H centimetres - **Sensor type:** Electrochemical - **Style:** Single - **Unit count:** 1.0 count ## Images ![FA3820 Sealed Battery Carbon Monoxide Alarm - Image 1](https://m.media-amazon.com/images/I/51gt0uac51L.jpg) ![FA3820 Sealed Battery Carbon Monoxide Alarm - Image 2](https://m.media-amazon.com/images/I/21eQPzEP3ZL.jpg) ![FA3820 Sealed Battery Carbon Monoxide Alarm - Image 3](https://m.media-amazon.com/images/I/41TT1PDg4EL.jpg) ![FA3820 Sealed Battery Carbon Monoxide Alarm - Image 4](https://m.media-amazon.com/images/I/41KMpZI-HDL.jpg) ![FA3820 Sealed Battery Carbon Monoxide Alarm - Image 5](https://m.media-amazon.com/images/I/418rhBGw4tL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Questions & Answers **Q: Silence mode how to set up? Pressing test button gives me alarm. What's the point then?** A: 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. **Q: To Seller: What is the battery (lithium) expiry date printed on the box? Thank you.** A: 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. **Q: Can this be used outdoors for my patio heater ?** A: 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. **Q: 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** A: When I activated the test procedure the alarm volume increased and was fairly loud. ## Frequently Bought Together - FireAngel Carbon Monoxide Detector 10-Year Life Sealed Battery - FA3820 Carbon Monoxide Alarm for Home and Holiday - Portable CO Alarm - Travel Carbon Monoxide Detector and Monitor - White - FireAngel Optical Smoke Alarm 2-Pack - FA6620 10-Year Battery Smoke Alarms for Home with Test/Silence Button - Replacement for FireAngel ST-622/ST-620 - Early Smoke Detector Fire Alarm - White - FireAngel Heat Alarm with 10 Year Sealed For Life Battery, FA6720-R (HT-630 replacement, new gen), White --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/470810555-fa3820-sealed-battery-carbon-monoxide-alarm](https://www.desertcart.co.uk/products/470810555-fa3820-sealed-battery-carbon-monoxide-alarm) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-10-06*