This portable air quality tester adopts a stable performance and high detection accuracy sensor, supporting real-time monitoring of CO2 concentration, temperature, and relative humidity in the air. Digital TFT LCD display, with brightness automatic adjustable function, so you can see the readings at a glance. Equipped with air quality level classification function, power saving mode, Type-C interface detection, touching buttons, and other functions to meet your usage needs. There are multiple custom setting options, including screen off time, CO2 calibration, temperature unit switching, sound and vibrating switch, etc., which make your usage experience more personalized and convenient. 3D porous housing with multiple ventilation holes designed for real-time air circulation convection. The sensor and theair are fully contacted, highly sensitive, and accurate in the detection of small particle content. It can be widely used in a variety of occasions. Features: Compact and Exquisite: Compact body design, simple and stylish appearance, lightweight, and easy to carry. 3D porous housing with multiple ventilation holes designed for real-time air circulation convection. The sensor is in full contact with the air for high sensitivity and accurate detection of small particle content. High Accurate Sensor: Adopting non-dispersive infrared (NDIR) technology, it detects and accurately displays the carbon dioxide concentration in the air in real-time. Its high resolution of up to 1PPM and measurement accuracy of ±50+5%* ensure the accuracy and reliability of the data. The device also integrates temperature and humidity detection functions, allowing you to keep track of the air quality around you wherever you are. Air Quality Classification & Intelligent Alarm: Equipped with an air quality classification function, 4 different colors correspond to different air quality classes, allowing you to understand the current air condition more accurately and graphically. When the carbon dioxide concentration reaches 1500PPM, the device will automatically vibrate and promote a sound alarm, reminding you to take timely measures to protect your and your family's health. Multi-function Design: This product combines power saving mode, Type-C interface detection, touching buttons, and other functions to meet your usage needs. There are multiple custom setting options, including screen off time, CO2 calibration, temperature unit switching, sound and vibrating switch, etc., which make your usage experience more personalized and convenient. Intelligent Energy Saving and Humanized Design: The display has an automatic brightness adjustment function that automatically adjusts the screen brightness according to the ambient light to conserve power. You can also monitor carbon monoxide levels even when the screen is turned off to conserve battery lifespan. It supports USB Type-C continuous power input and has a built-in 800mAh lithium battery to ensure a long lifespan. Convenient to Carry & Widely Used: It adopts lightweight lanyard design for easy to carry. It can be widely used in a variety of occasions, such as homes, greenhouses, camping barbecues, factories, automobiles, environmental monitoring, and so on. Specifications: Name: Air Quality Tester Material: plastics Battery: 1 * built-in 800mAh lithium battery (included) Powersupply: 5V, 2A Type-C interface CO2 detection ranges: 400-5000ppm CO2 detection accuracy: ±(50+5%*of reading)PPM Temperature detection ranges: 0-50 Temperature detection accuracy: ±1 Humility detection ranges: 0-99%RH Humility detection accuracy: ±5%RH Item size: 50 * 85 * 17mm / 1.97 * 3.35 * 0.67in Item weight: 54g / 1.90ounce Package size: 135 * 96 * 31mm / 5.31 * 3.78 * 1.22in Package weight: 130g / 4.59ounce Packing List: 1 * Air Quality Tester 1 * Type-C Cable 1 * Lanyard 1 * Instruction