400-5000ppm Wall-mounted Rechargeable CO2 Detector Meter Digital Carbon Dioxide Air Quality Monitor Temperature Humidity NDIR Sensor            Description     4-In-1 function, CO2 detection, temperature detection, humidity detection, carbon dioxide exceeding alarm function.            Feature     1.High-Performance Chip: Equipped with independent NDIR sensor. It is used to measure CO2, temperature and humidity, including a complex NDIR sensor high-performance chip. 2.Large Screen Design: The size is about 27*9*3.5cm/10.63*3.54*1.38in. The large screen, adjustable screen brightness, clear data at a glance. Under hangable design, it is very suitable for gyms, classrooms, offices and workplaces. 3.Automatic Alarm System: When the CO2 concentration exceeds 1000PPM, the alarm will be issued to notify you to keep the indoor environment ventilated in time. 4.Long Standby Time: It is equipped with a 2000mA rechargeable battery, and three-meter-long USB data cable. And it can be used for more than 8 hours when fully charged. 5.4 Colors Display: There is 4-color display for CO2 concentration. 0-999PPM: green light flashes (the CO2 concentration exceeds 1000PPM and the alarm sounds), 1000-1999PPM: yellow light flashes. 2000-2999PPM: orange light flashes. 3000-3999PPM: red light flashe. And the large screen design makes it possible to observe internal air quality situation of your room at any time.            Specifications:     Material: ABS CO2 Technology: NDIR Temperature Unit: between Celsius and Fahrenheit switches Working Time: 24-hour real-time monitoring Detection Range: CO2 (400-5000ppm) Power Supply: three-meter USB data cable Product Size: about 270*90*35mm/10.63*3.54*1.38in Product Weight: about 280g Battery: Lithium-ion battery 2000mAh Voltage Input: USB DC 5V Alarm Function: can be turned on and off by manual operation CO2 Concentration Display in 4 Colors: 0-999PPM: green light flashing (the CO2 concentration exceeds 1000PPM and alarms.) 1000-1999PPM: yellow light flashing 2000-2999PPM: orange light flashing 3000-3999PPM: red light flashing            Packing List:     Host*1 Manual*1 Charging Cable*1            Notes:     -Due to the lighting effects and shooting angles, there is color difference in the product, please understand. -Due to manual measurement, there is tolerance in the product size.