DFRobot Compute Module 4 (CM4) IoT Router Carrier Board Mini is an internet expansion board based on the Raspberry Pi Compute Module 4. By connecting with a gigabit network card via PCle, the board brings Raspberry Pi CM4 to two full-speed. The CM4 board features OpenWRT open-source router system and is compatible with Raspberry OS, Ubuntu Server, and other Raspberry Pi systems. This board operates at a 5V input voltage, 3A current through a USB-C port, and 0°C to 80°C operating temperature range. The CM4 board retains the characteristic GPIO pin header of Raspberry Pi and is used in applications such as actuators, sensors, and smart cooling fans.