Features:  With the big display screen, so you can see the data more clearly, which can give you a fine using experience.  This product can not only detect the CO2 for you, but also can detect TVOC, HCHO, temperature and humidity, which can give you the data that you care about.  This product is in small size, so you can carry it with you to anywhere you want to use it.  With the intelligent alarm function by the color and voice, which can tell you the current air quality level.  A wide application: you can use this product for home air detect, car air detect, office air detect and so on.  With the high accuracy chip, which can accurately captures the weak current generated during the electrochemical reaction process and accurately calculates the HCHO measurement results.    Specifications:  Color: black+white  Material: ABS  Working temperature: 10~50℃  Alarm: color, voice  Battery: 3.7V, 1200mAh (included)  Item size: 98 * 67 * 32mm / 3.9 * 2.6 * 1.3in  Item weight: 141g / 5.0ounce  Package size: 150 * 100 * 50mm / 5.9 * 3.9 * 2.0in  Package weight: 300g / 10.6ounce    Packing List:  1 * CO2 Detector  1 * USB Cable  1 * User Manual