... LCD Diplayer Carbon Monoxide Alarm Model No: XCD-01 85 decibel alarm sound.The electrochemical carbon monoxidesensors.Alarm beeps model -- four short alarm. Red,LED ... unit (yellow LED fault).If the memory, alarm device, warnedGreen LED flash button, every second, once ... showPower supply: DC9VThe sensitivity and time: 50ppm, alarm in 60-90 minutes100ppm, alarm in 10 ~ 40 minutes300ppm, alarm in 3 ...