General description Built-in carbon monoxide alarm with a digital LED display, this device features an electro-optical sensor for high consistency and stability. Its unique design ensures both functionality and aesthetic appeal. Technical specifications Measurement range: 0-999 ppm Alarm sound: ≥75 dB (1m in front) Alarm concentration: bright screen at 50 ppm, alarm at 150 ppm Working environment: temperature -20~60℃, relative humidity ≤95% Product dimensions: 10 x 10 x 4 cm Battery: DC3V (2 x 1.5V AA batteries, not included) Product life: up to 10 years Usage Applicable places: residential areas, shops, hotels, restaurants, office buildings, schools, banks, libraries, computer rooms, warehouses, etc. Alarm modes: on-site alarm with sound and flash alert Other information Packing list: carbon monoxide alarm, certificate, manual, installation screw package, color box When a dangerous level of CO gas is detected, a loud 75 decibel alarm beep and red LED flash provide an instant alert.