With High-Precision Sensor: With a high-precision sensor, our air quality monitor can detect and display the temperature and humidity of the environment, carbon dioxide concentration, and can switch between and , which will help users know the environment. Fast Charging: The air quality monitor has a built-in 2400mAh lithium battery, so it only takes 1-2 hours to fully charge and has 10-12 hours usage time or 18 hours standby time. Clear Display: Square design, large display, different colors mean different air quality, green 0-700ppm, orange 700-1500ppm, red (buzzer sound) 1500-5000ppm. Easy to View: Because our air quality monitor has a back suspended hole, you can hang it on the wall. It is easy to view and space-saving. After-sales Service: We provide the best quality products and the best service. If you have any questions, you can contact us and we will provide a variety of solutions for you to choose from. Our Air Quality Monitor features with high accuracy to help you know the indoor environment anytime. It is suitable for office, bedroom, hall and other places. Specifications: Name: Air Quality Monitor Material: ABS Size: about 98*90*42mm/3.86*3.54*1.65in Net weight: about 231g Temperature: -10~40 Humidity: 0~99%RH Carbon dioxide: 0-5000ppm Manual and automatic calibration function Power cord: Type C to USB Alarm: buzzer + indicator bar to make an alarm Battery level detection: remaining battery display Charging: charging status display Packing List: Air Quality Monitor*1 Data Cable*1 Manual*1 Notes: Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance. Due to manual measurement, there might be a tolerance in the product size.