Carbon Monoxide Detector Powered by AA Battery (not Included),CO Monitoring Alarm with LCD Display Screen, Used for Home Basement Kitchen, Hotel Garage, Bedroom, Living Room Voice Alarm 3 Pack

How to verify that lsenlty co detector is working properly Place a linhted cigarette over the detector Side vent. the CO value increase on the display. when the CO concentration exceeds 50PPM,the detector will sound an alarm. Larger detection range: CO range: 0 to 1000PPM; Humidity range: 0% to 95%RH; Temperature range: -4 to 140 ℉. The cycle alarm works when the CO is over 50ppm.

• High precision and high sensitivity sensors - Our carbon monoxide detector instrument sensors use highly reliable electrochemical sensors with excellent repeatability and stability, sensitive response, and rapid alarm, allowing you to keep track of the air quality in your environment at all times.
• Portable design of LED digital display screen. Can install AA batteries and a new power-saving mode. Very suitable for outdoor and indoor activities, boats, vehicles, stove heating, airplanes, camping tents, and other enclosed spaces; It will be a good helper for you.
• How do we need to test it? Carbon monoxide is produced in incomplete combustion and thick smoke. We can place it close to cigarettes or paper that produces thick smoke from burning. The concentration of CO will change and be displayed on the screen. Do not test at the exhaust port or ventilation area of the car. Low CO concentration will not trigger the sensor to work, and the larger particles in the car exhaust will damage the accuracy of the sensor.
• This is an accurate carbon monoxide detector sensor. This compact design product is specifically designed for home and other outdoor and indoor use. Easy to install and portable. Because this product is suitable for night and outdoor use. If the light is too bright, it can harm the eyes and affect sleep. Therefore, the lighting on the display screen will be relatively dim, but it can ensure that you can still see clearly at night."
• Worry-Free After service - We provide 30 days no reason to refund service. If you have any questions, please contact us, we will solve your problem as soon as possible.