First Alert Co400b White Carbon Monoxide Detector – 85 db Dual Audible/visual Alarm, Electrochemical Sensor

Introducing the First Alert CO400B Carbon Monoxide Detector, a sleek white safety device designed to safeguard your home against invisible CO threats. Its compact, single‑sensor design blends seamlessly with any décor while delivering a powerful 85 dB audible alert paired with a bright visual strobe to warn occupants instantly. Equipped with a reliable power supply, the unit remains operational during power outages, ensuring uninterrupted protection.

Why this detector matters: Carbon monoxide is a silent killer; this unit provides round‑the‑clock monitoring so you can breathe easy knowing a reliable alarm will sound at the first sign of danger. The electrochemical sensor ensures precise detection, reducing false alarms and giving you confidence in its performance. Its low‑maintenance design requires only periodic battery replacement, making it a hassle‑free addition to any safety plan.

• Electrochemical Sensor Technology: Delivers accurate CO measurement with rapid response, boosting home safety and meeting industry standards.
• 85 dB Dual Alarm System: Combines a loud audible tone with a flashing visual light, guaranteeing notification even for sleeping or hearing‑impaired residents.
• Compact White Housing: Minimalist design fits discreetly on walls or ceilings without disrupting interior aesthetics.
• Single‑Gas Detection: Focused monitoring of carbon monoxide provides reliable, targeted protection without cross‑sensitivity to other gases.
• Easy Installation & Maintenance: Plug‑in power source with battery backup ensures continuous operation; test button allows quick checks of functionality.

Secure Your Space with Confidence: The First Alert CO400B stands out as a dependable guardian, merging advanced sensor technology with user‑friendly features. Its audible/visual alerts are engineered to cut through noise and darkness, delivering peace of mind for families, renters, and businesses alike. With certifications meeting UL standards, the CO400B offers industry‑approved assurance, while its intuitive test feature lets you verify readiness in seconds. Trust this white‑finished detector to act swiftly, alerting you before carbon monoxide reaches hazardous levels, and keep your environment safe day after day.