{"product_id":"first-alert-carbon-monoxide-detector-co400-1-pack-battery-operated-5-year-sensor-85-db-alarm","title":"First Alert carbon monoxide detector CO400 — 1-pack battery-operated, 5-year sensor, 85 dB alarm","description":"\u003cstrong\u003eThe First Alert CO400 is a compact, battery-operated carbon monoxide detector with a five-year electrochemical sensor and an 85 dB alarm for dependable CO monitoring.\u003c\/strong\u003e\n\n\u003cp\u003eThis single-pack CO alarm from First Alert uses an electrochemical sensing element — a technology known for stable, accurate detection of carbon monoxide — and runs on a replaceable 9V battery so it works during power outages. The unit is ready to place on a shelf or mount on a wall with the included bracket; no hardwiring is needed. A test\/silence button verifies operation and temporarily quiets nuisance alerts, while audible and visual low-battery warnings tell you when to change the battery.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the CO400 detect carbon monoxide and how long does it last?\u003c\/h3\u003e\n\u003cp\u003eThe CO400 employs an electrochemical sensor that reacts specifically to CO gas, producing reliable readings over its service life. The sensor is permanent for the detector and is rated to last up to five years before replacement is recommended.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eElectrochemical sensor technology for accurate CO detection.\u003c\/li\u003e\n  \u003cli\u003eSensor lifespan: up to 5 years.\u003c\/li\u003e\n  \u003cli\u003eEnd-of-life chirp alerts when the unit needs replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat power source does it use and what happens during outages?\u003c\/h3\u003e\n\u003cp\u003eThis model is powered by a single 9V replaceable battery, so it continues monitoring even when household power fails. The unit issues audible and visual battery warnings so you can replace the battery before protection is lost.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRuns on one 9V replaceable battery (included or user-supplied).\u003c\/li\u003e\n  \u003cli\u003eMaintains monitoring through electrical outages.\u003c\/li\u003e\n  \u003cli\u003eLow-battery signals include both sound and visual indicator.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow loud is the alarm and can I test or silence it?\u003c\/h3\u003e\n\u003cp\u003eThe CO400 sounds an 85-decibel horn when carbon monoxide levels reach alarm thresholds, loud enough to wake a sleeping household. A combined test\/silence button allows you to check that the detector is functioning and to temporarily silence non-emergency chirps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e85 dB alarm for effective wake-and-notice capability.\u003c\/li\u003e\n  \u003cli\u003eTest\/silence button for quick functional checks and temporary silencing.\u003c\/li\u003e\n  \u003cli\u003eUnit will re-alarm if dangerous CO levels persist after silencing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhere should I place the CO400 and how many do I need?\u003c\/h3\u003e\n\u003cp\u003ePlace one detector on each level of your home and outside sleeping areas for broad coverage; a detector in each bedroom is recommended for maximum safety. The CO400’s compact design lets you set it on a tabletop or use the optional wall mount—no electrical outlet required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for bedrooms, hallways, basements, and utility areas.\u003c\/li\u003e\n  \u003cli\u003eNo hardwiring—ideal for rental units and temporary needs.\u003c\/li\u003e\n  \u003cli\u003eUse one per floor and one outside each sleeping area for best coverage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Homeowners, renters, and landlords who want a simple, battery-operated carbon monoxide detector with proven electrochemical sensing and a five-year service life will find the First Alert CO400 a practical choice. It’s especially useful where hardwiring isn’t possible or for supplemental protection in bedrooms and finished basements. UL-listed and backed by First Alert’s home-safety experience, the CO400 offers straightforward installation, clear status alerts, and a compact profile for versatile placement.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long does the CO400 sensor last?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The electrochemical sensor is rated to last up to five years, after which the unit will chirp to indicate end of life.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the CO400 work during a power outage?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It runs on a replaceable 9V battery so it continues to monitor carbon monoxide during power failures.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"First Alert","offers":[{"title":"Default Title","offer_id":54593655800147,"sku":"B000N8OYXI","price":44.53,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1095\/4257\/2371\/files\/first-alert-co400-front-view.jpg?v=1786774720","url":"https:\/\/findsworth.co.uk\/products\/first-alert-carbon-monoxide-detector-co400-1-pack-battery-operated-5-year-sensor-85-db-alarm","provider":"Findsworth","version":"1.0","type":"link"}