The industrial expansion module designed based on Raspberry Pi CM4 has common interfaces such as Gigabit Ethernet, HDMI, USB and GPIO on board, supports external wireless communication modules such as 4G/5G/LoRa through M.2 or Mini-PCIe, and also expands industrial interface resources such as RS485, CAN and RTC. The industrial rail housing design is very suitable for building IoT gateways, 4G/5G routers Colour:Black Material:ABS Precautions for use 1: Do not unplug or plug any device except USB and HDMI when powered 2: Confirm the fan voltage before connecting. 5V and 12V are supported. 12V is connected by default. Please modify the resistance of FAN_VCC when switching 3: In order to ensure the normal power supply of CM4, please do not connect other devices when burning the image using the Type C interface. 4: The module needs to provide 5V 2.5A /12V 1A or higher power supply. Otherwise, there may be problems such as automatic shutdown, frequency reduction, etc. 5: Do not power the 12V DC interface and the 5V Type c interface at the same time 6: USB2.0 is turned off by default. If you need to turn it on, you need to add dtoverlay=dwc2,dr_mode=host in config.txt Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Package Contents: 1x Expansion Board Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.