General description 10 Year Life Carbon Monoxide Alarm with Digital Display is a reliable and essential safety device designed to detect carbon monoxide (CO) levels in various environments such as residential areas, shops, hotels, restaurants, office buildings, schools, banks, libraries, and warehouses. It features a built-in electro-optical sensor that ensures high consistency and stability, along with a visually appealing design. Technical specifications Measurement range: 0-999 ppm Alarm sound: ≥75 dB (at 1m distance) Alarm concentration: 50 ppm (bright screen), 150 ppm (alarm) Working environment: temperature -20 to 60℃, relative humidity ≤95% Product dimensions: 10 x 10 x 4 cm Battery: DC 3V (requires 2 x 1.5V AA batteries, not included) Product life: up to 10 years Installation Includes installation screw package for easy mounting. Refer to the manual for detailed installation instructions. Usage The carbon monoxide alarm provides audio and visual warnings when dangerous CO