Heiman Detector Carbon Monoxide Detector Combo 10 Year Battery

Additional Details from the Manufacturer

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• 【MOUNT IT RIGHT. FEWER FALSE ALARMS】Keep 10 ft from cooking (even open kitchens), 3 ft from A/C vents & bathroom doors, 4 in from walls. Wrong placement is a leading cause.
• 【10-YEAR SEALED BATTERY WITH EOL ALERT】Built-in sealed lithium battery powers the alarm continuously for 10 years — no battery replacements needed. When the unit reaches end of life, a clear audible EOL alert notifies you it's time to replace the detector, ensuring continuous protection throughout its full lifespan.
• 【UL 217 10TH EDITION & UL 2034 5TH EDITION CERTIFIED】Certified to the latest safety standards — UL 217 10th Edition and UL 2034 5th Edition. The 10th Edition introduces enhanced cooking nuisance immunity tests and stricter requirements for modern synthetic-fueled fires, delivering upgraded detection capabilities for today's homes.
• 【PHOTOELECTRIC SMOKE & ELECTROCHEMICAL CO DETECTION】Dual-sensor protection in one device: a photoelectric smoke sensor with dual-LED optical chamber detects slow-smoldering fires while reducing cooking false alarms, and an electrochemical CO sensor monitors carbon monoxide levels from 0–2000 ppm with 1 ppm resolution. Smoke sensitivity: 1.65–2.29%/ft obscuration.
• 【ETL LISTED — 4 CERTIFICATIONS】Independently tested and certified to US standards (UL 217 Ed.10 + UL 2034 Ed.5) and Canadian standards (CAN/ULC S531 Ed.5 + CSA 6.19). 94V-0 flame-retardant housing.
• 【EASY INSTALL & RESIDENTIAL USE】Quick twist-and-click mounting bracket included — no wiring required. Compact 4.9-inch diameter fits neatly in any room. 85dB alarm with LED indicator and test/silence button. Suitable for bedrooms, living rooms, hallways, and other residential indoor spaces where both smoke and CO hazards may be present.