... consistency Hush Function,Sensor Fault LCD Home CO Alarm Detector and Carbon Monoxide AlarmReliable Electrochemistry Carbon Monoxide SensorLCD ... current:≤25mASensitivity of CO: 50ppm, detector alarm in 60-90 minutes100ppm, alarm in 10 ~ 40 minutes300ppm, alarm in 3 minutesRange: ... 0-999PPMOperating conditions: 5-40°c, 20 ˜90%. R. ...