The industrial expansion module designed based on CM4 has common interfaces such as Gigabit Ethernet, , 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 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 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 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.