Reddit reviews Winfi CO Detector,Carbon Monoxide Gas Detection,Digital Display Carbon Monoxide Alarm with LCD Digital Display,Battery Powered (High-Precision)

Very easy to install at home or bedroom. Precise electro-optical sensor, high consistency and stability, move, or in the same place for that. Loud enough and sounds good.Whenever dangerous levels of CO are present, red LED will flash and the alarm pattern will sound. Loud 85 decibel alarm with LED Flash While in the Alarm Mode for the Life-Saving Safety.Alarm standard: 50ppm, alert within 60 to 90 minutes; 100ppm, alert within 10 to 40 minutes; 300ppm, alert within 3 minutes. Note: When you test the detector, please do not use gas blow the hole directly.A perfect item for protecting your family from the dangers of carbon monoxide includes a blue backlight digital display feature. With 3 digits LCD Displayer is Optional, 'Err' on the LCD to indicate the unit is malfunctioning. 'Lb' on the LCS to indicate it low battery and need to replacement. '999ppm' on the LCD to indicate CO level over 999ppm. If the Co leakage is less than 999p.Operated by 3 x 1.5V AA Batteries (not included), the alarm sound pattern is 4 beeps every 5seconds for the first 4 minutes. In 4 minutes, it will change to 4 beeps ever minute to save the battery.