Features: Accurately monitors CO2, TVOC, HCHO, humidity, and temperature. Allows real-time environmental monitoring. Equipped with a fast-responding, sensitive, high-performance chip that precisely captures the weak current generated during electrochemical reactions. Built-in 1200mAh rechargeable battery ensures extended operation. Designed for efficient heat dissipation to prevent overheating and maintain measurement accuracy. This air quality monitor is intended for indoor use. For best results, close doors and windows before testing to ensure accurate readings. Allow the device to operate for at least 60 minutes before interpreting the data. Specifications: Component: ABS Type: Black+Blue / White+Blue Size: Approx. 70x35x90mm / 2.75x1.37x3.54 inches Package Includes: 1 x Air Quality Monitor Note: 1. Please allow 1-2cm measurement deviation due to manual measurement. 2. The actual product color may vary slightly due to differences in monitor displays.