
Light and Sound Alarm Warning: When a dangerous level of carbon monoxide is detected, the red LED flashes and the alarm model emits an 85 decibel alarm to protect your family's life and property safety from the CO detector. Alarm Standard: The alert time depends on the carbon monoxide concentration level. 50 ppm, alert within 60-90 minutes; 100 ppm, alert within 10-40 minutes; 300 ppm, alert within 3 minutes. High quality carbon monoxide detector, certified to EN 50291, equipped with a high-precision and reliable electrochemical CO sensor with long life to quickly detect CO gas leaks: Power supply: (DC3V) 2AAA size batteries.Sensor type: Electrochemical gas detection type: Carbon monoxide Material: ABS