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LCD displayer with a blue backgroud light, loud 85 decibel alarm, permanent carbon monoxide sensor
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3 digits LCD displayer is optional. 'Err' on the LCD to indicate
the unit is malfunctioning. 'Lb' on the LCD to indicate it low battery
and need replacement. '999ppm' on the LCD to indicate CO level over
999ppm. If the Co leakage is less than 999ppm but over 30ppm, it would
show its actual concentration.
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Alarm standard: 50ppm, alarms within 60 to 90 minutes; 100ppm,
alarms within 10 to 40 minutes; 300ppm, alarms within 3 minutes.
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Alarm Warning: When a dangerous level of carbon monoxide is
detected, the red LED will flashes and the alarm pattern will be heared.
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Energy-Saving: Operated by 3 x 1.5V AA batteries (not included),
The alarm sound pattern is 4 beeps every 5 seconds for the first 4
minutes. In 4 minutes, it will change to 4 beeps ever minute to save the
battery.