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 Detector Material: ABS, Electronic component Gross Weight: 213g / 7.5oz Product Size: 9x7x3.5CM / 3.5x2.8x1.4in CO2 Detection Range: 400-6000ppm ±50 ±5%PPM CO2 Detection Accuracy: 1ppm Temperature Measurement Range: -10℃-50℃ Temperature Measurement Accuracy: ±2℃ Humidity Measurement Range: 0-99%RH Humidity Measurement Accuracy: ±3%RH Battery: Built in rechargeable 1500mAh lithium battery, Model: 18650(Delivered with built in battery). Package List: 1 x Carbon Dioxide Detector1 x USB Data Cable 1 x Manual