Feature: 1. 4-in-1 Comprehensive Monitoring: The indoor air quality monitor serves as an all-in-one solution, capable of simultaneously measuring carbon dioxide concentration, volatile organic compounds (TVOCs), temperature, and humidity. This multifunctional device ensures you have all the necessary information to maintain a healthy indoor environment. 2. Rechargeable Battery Powered: Equipped with a built-in 2500mAh lithium battery, the CO2 TVOC temperature humidity monitor can be conveniently charged using a USB cable, offering long-lasting monitoring without the constant need for replacement batteries, making it both eco-friendly and cost-effective. 3. Colorful Display for Easy Reading: Featuring a vibrant color screen, the air pollution detector displays current CO2 levels, temperature, and humidity data. The color ring changes according to CO2 content, providing a visual cue to quickly assess air quality levels at a glance, ensuring your indoor environment is always safe and comfortable. 4. User-Friendly Operation: With a simple long press of the power button, the portable carbon dioxide detector is easy to turn on and off. It automatically detects carbon dioxide levels after a 120-second countdown preheating time, making it straightforward for anyone to use and ensuring your home's air quality is constantly monitored without hassle. 5. Compact and Portable Design: