Ecoey Carbon Monoxide Detectors with Digital LCD Display, Carbon Monoxide Alarm Replaceable Battery Operated, 10 Year Lifespan CO Alarm Detector with Mute Mode for Home, 4 Packs 3-Year Battery 4 PACKS

Advanced Electrochemical CO Sensor: Ecoey's carbon monoxide detector is equipped with an electrochemical CO sensor that quickly and accurately detects dangerous CO levels from 23 ppm to 999 ppm with greater than 85 dB alarm sound to warn you as early as possible
Minimalistic & Portable Design: Wall-mounted or desktop-mounted on your decision. The CO detector's compact and portable design makes it capable of handling a variety of occasions like office, hotel, and travel
Long-Lasting Protection: A 10-year carbon monoxide alarm's lifespan with 3-year replaceable batteries ensures home safe. Greatly reduced costs in time for your family
Peak CO Concentration Memory: The visual LCD automatically records and saves the peak CO levels when an accident occurred, so an alarm triggered when you are outside the home can be confirmed using the recorded peak value
Child & elder-friendly: This CO alarm owns a 3-colored LED indicator (green, yellow, red ) to display different working states like alarm, Low voltage, or fault along with audible beeps, allowing you to easily determine the alarm status