This CO2 detector can accurately and quickly test CO2 levels indoors to protect your health. Also, provides real-time monitoring of indoor temperature and humidity.Using infrared technology, high measurement accuracy, fast response, resolution up to 1ppm, can accurately detect CO2 in the , the measurement range up to 400-5000ppm.This indoor carbon dioxide meter has 4-color LED indicators as an quality warning. Different color indicators will flash according to CO2 content, which makes quality more intuitive.1200mAh rechargeable battery provides 240-360 minutes of standby time and can be recharged via Type-C charging port. 2.8 inch LCD screen with backlight display, clear and soft display, thus making reading clear.Portable size, easy to carry around. Simple operation. No need to calibrate after starting up, work and detect automatically. It can be used at various occasions such as office, car, school, hotel, greenhouse vegetables, production warehouses, raw materials processing, etc.Carbon Dioxide Instructions:0~799ppm: green light flashes800~1199ppm: yellow light flashes1200~1599ppm: orange light flashes1600~1999ppm red light flashesAbove 1999ppm, four-color lights flashDisplay Mode: LED digital display + LCD Screen + backlightCO2 Detection Technology: InfraredCO2 Measurement Range: 400-5000PPMCO2 Detection Sensitivity: 1PPMTemperature Measurement Range: 0-50CTemperature Measurement Accuracy: 1CHumidity Measurement Range: 0%-99%RHHumidity Measurement Accuracy: 2%RHBattery Capacity: 1200mAh Lithium batteryCharging Port: 5V Type-C PortProduct Size: 9.0 x 7.0 x 3.5cmProduct Weight: 129gModel Number: Detectorcolor:BlackMaterial:plasticPackage Contents:1 x CO2 Carbon Dioxide DetectorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.