4-IN-1 Multifunctional carbon monoxide monitor can accurately detect the current CO concentration, CO2 concentration, temperature and humidity in the air. Let you understand the air quality more clearly and protect the health of you and your family. our CO detector can be placed on a table or hung . According to the CO concentration data, it can present a 3-stage visual virtual bar display. The default CO concentration will alarm if it exceeds 150PPM. You can double-click the "O" button to customize the CO concentration alarm value. If you want to turn off the alarm sound, you can long press the "+" button to switch the buzzer on/off. The portable air quality monitor not only supports CO concentration exceeding standard alarm, but also has the function of CO2 concentration exceeding standard alarm. When the CO2 concentration in the air exceeds 1500PPM, the buzzer will work and emit a gentle alarm sound "Bi-Bi-Bi-" to remind you to take action to protect the health of you and your family. The high-definition LCD backlit screen allows you to read easily even at night. When the CO detector is not operated for 10 minutes, it will automatically turn on the energy-saving mode (the screen brightness will be turned off), and you can click the "-" button to turn on/off the backlight. Specifications: Model: PTH-9E Measurement Object: CO, CO2, temperature and humidity Carbon Monoxide Measurement Range: 0-500 ppm (5% or 10ppm) Carbon Dioxide Measurement Range: 400~5000 ppm (5% or 50ppm) Temperature Measurement Range: 0 -50 (1.5 ) / 32 -122 (2.7 ) Humidity Measurement Range: 20%-80% RH (5% RH) Power Supply: built-in Li-ion Cylindrical battery (3.7V 2400mAh) Input: Type C(5V=1A) Light Indicating Sound Alarm: Green: 0-100PPM, good level Yellow: 101-150PPM, normal Red: above 151-500PPM, adverse level, sound alarm Material: ABS colour: black Package Contents: 1 x Carbon Monoxide Detector 1 x USB cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.