This CO2 detector can accurately and quickly test CO2 levels indoors to protect . 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 air, the measurement range up to 400-5000ppm. This indoor air carbon dioxide meter has 4-color LED indicators as an air quality warning. Different color indicators will flash according to CO2 content, which makes air 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 occasions such as office, car, school, hotel, greenhouse vegetables, production warehouses, raw materials processing, etc. Carbon Dioxide Instructions: 0~799ppm: green light flashes 800~1199ppm: yellow light flashes 1200~1599ppm: orange light flashes 1600~1999ppm red light flashes Above 1999ppm, four-color lights flash Display Mode: LED digital display + LCD Screen + backlight CO2 Detection Technology: Infrared CO2 Measurement Range: 400-5000PPM CO2 Detection Sensitivity: 1PPM Temperature Measurement Range: 0-50C Temperature Measurement Accuracy: 1C Humidity Measurement Range: 0%-99%RH Humidity Measurement Accuracy: 2%RH Battery Capacity: 1200mAh Lithium battery Charging Port: 5V Type-C Port Product Size: 9.0 x 7.0 x 3.5cm Product Weight: 129g Model Number: Air Detector color:White Material:plastic Package Contents: 1 x CO2 Carbon Dioxide Detector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.