1、MULTI INTERFACE: Based on for Raspberry Pi CM4 design with UPS industrial expansion module, the board has Gigabit Ethernet, HD multimedia interface, USB and GPIO and other common interfaces. 2、M.2 B KEY INTERFACE: Wireless expansion module supports the external connection of 4G/5G wireless communication modules through M.2 B KEY, and also extends industrial interface resources such as RS485, CAN and RTC. 3、AUTOMATIC SWITCHING: Expansion module access to external power supply, will simultaneously power the system and lithium battery charging disconnect the external power supply, will automatically switch to lithium battery power supply, on board UPS module, disconnect the power line can still work normally. 4、APPLICATIONS: The industrial rail housing design is very suitable for building IoT gateways, 4G/5G routers, IoT data acquisition, or even using it as a programmable logic controller in industrial automation and control systems, etc. 5、PCB MATERIAL: CM4 industrial expansion module is made of PCB material, which will not deform for a long time, thus ensuring the stability for a long time.