Feature:1. Multi Function: It integrates the three functions of carbon dioxide detection, temperature detection and humidity detection, allowing you to intuitively understand the air quality of the living space.2. Infrared: Using infrared sensor to monitor carbon dioxide has faster speed, high accuracy, stable performance, strong anti interference ability, low consumption and long service life.3. Large Screen: Equipped with a large screen, different font colors display different air quality, which is convenient for you to check the air quality at any time.4. Heat Dissipation: The left and right vents not only speed up the convection between the air and the machine for effective detection, but also provide excellent heat dissipation.5. Wide Applications: This temperature and humidity tester suitable for a wide range of places, such as schools, hospitals, restaurants, shopping malls, offices, homes, etc.Specification:Item Type: Carbon Dioxide DetectorMaterial: ABS, Electronic componentGross Weight: 213g / 7.5ozProduct Size: 9x7x3.5CM / 3.5x2.8x1.4inCO2 Detection Range: 400-6000ppm 50 5%PPMCO2 Detection Accuracy: 1ppmTemperature Measurement Range: -10-50Temperature Measurement Accuracy: 2Humidity Measurement Range: 0-99%RHHumidity Measurement Accuracy: 3%RHBattery: Built in rechargeable 1500mAh lithium battery, Model: 18650(Delivered with built in battery).Package List:1 x Carbon Dioxide Detector1 x USB Data Cable1 x Manual