The ZEHS04 is an all-in-one monitoring module that supports both pump-suction and diffusion sampling methods. It integrates the ZE12 atmospheric monitoring module to detect CO, SO2, NO2, and O3 in the air, consolidating the collected signals into a single output. The module also offers expandability, allowing for the addition of sensors such as dust (particulate matter) sensors and temperature/humidity modules. It provides serial (TTL) or RS485 output, facilitating ease of use and debugging for the user. This significantly shortens the design and development cycle, effectively meeting customer requirements for various gas-detection applications.