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. Description: 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.