Description 1. Screen Display Design:1.9inch Ultra-High Definition Color IPS Display Screen, easy to read. 2. High Accuracy Non Dispersive Infrared(NDIR) Technology: It can real-time monitoring CO2, temperature and humidity,which is more accurate, more and more durable than electrochemical sensors to detect carbon dioxide concentration. 3. Three Button Design:The CO2 monitor with three buttons design,The M key can adjust the brightness, it has 3 different brightness, the low brightness mode can help you save the battery, the Power button can Switching degree Fahrenheit and Celsius with short press, long press is to turn on or off the device, The S key can turn on or off the Alarm with short press, long press to calibration data. 4. and convenient:The CO2 Monitor is lightweight and , combining beauty and technology, easy to carry, with an anti-loss hanging rope, allowing you to keep informed of environmental changes around you. 5. Long Battery life: It built-in a capacity and can work about 16~20 hours, USB fast chaging. CO2 concentration measurement range:400-5000ppm time: 35S Working temperature: -10~ 50 Degree Display:LCD HD display Battery capacity:700mAh Charging :USB C Cable Package Included: MINI CO2 Detector* 1pcs USB C Cable* 1pcs English manual* 1pcs Colour:black Material:ABS Package Contents: 1 set x Indoor Air Quality 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.