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. 1 x Expansion Module (Ship with Inbuilt Battery)3 x Battery1 x Screwdriver Item Type: Industrial IoT Wireless Expansion ModuleMaterial: PCBCM4 Connector: Available for All Versions for Compute Module 4HD Multimedia Interface: HD Multimedia Interface, Supports 4K 30fps OutputUSB 2.0 Interface 3 Way 2.0 Interface, Support Various USB Devices PlugRJ45 Gigabit LAN Port: RJ45 Gigabit LAN Port, Supports 10/100/1000M Network AccessDC Power Supply Interface: 7 to 36V DC Power Supply InterfaceCM4 Status Indicator:Red Light (PWR): for Raspberry Pi Power IndicatorGreen Light (ACT): for Raspberry Pi Operating Status Indicator4G/5G Module Status Light:Red(STA): for Module Enable IndicatorGreen Light (NET): Module Operation Status LightPWR USB Interface: 5V DC Power Supply Interface or USB Burns in InterfaceM.2 B KEY: Support Access to 4G/5G or Other USB Channel Communication ModuleSIM Card Holder: Can Access Standard SIM Card for 4G/3G/2G Internet AccessBOOT SWITCH BUTTON: ON: for Compute Module 4 Boot up and Boot Transfer to USB Type C InterfaceOFF: Boot Up for Compute Module 4 to eMMC or Micro Storage CardUPS Switch Button: ON ON: Turn on the UPS to Power the CM4OFF: Turn off the UPS to Power the CM4DC Power Supply Interface: 7 to 36V DC Power Supply InterfaceDual Non Isolated RS485 Interface: Dual RS485 Interface with 600W, Surge and 15KV Electrostatic Protection (120R Optional Balanced Resistance Jumper Hat Reserved)Non Isolated CAN Interface: Static and Transient Spike Voltage Protection (120R Optional Balancing Resistor Jumper Hat Reserved)Micro Storage Card Interface: for Access to Micro Storage Card with System to Boot for Compute Module 4 LiteFAN Power Supply Option: Selectable 5V or 12V to Drive the FanCAM Interface: MIPI CSI Camera InterfaceRTC Battery Connector: Access to CR1220 Coin Cell BatteryM.2 VCC Power Supply Option: Select 3.3V or 4.2V Power SupplyRTC Interrupt Pin Switching: PI-RUNPI-RUN: RTC Trigger Interrupt CM4 RestartGN-EN: RTC Trigger Interrupt CM4 Power OffD4: RTC Trigger Interrupt D4 PinIO VREF Selection: CM4 IO Logic Voltage Switch 3.3V or 1.8VFAN Power Supply Selection: 12V (Default) or 5V Voltage Can Be Selected to Drive the FanSystem Function Switching: BT_DIS: Bluetooth Disable, only for CM4 Version with AntennaWiFi_DIS: WiFi Disable, only for CM4 Version with AntennaWP_DIS: Boot Mode Toggle, For Use Only if EMMC Boot or Storage Card boot is Not UsedRTC/FAN I2C Bus Selection: SDA0/SCL0: I2C-10 and CSI/DSI SharedGPIO3/2: I2C 1 and 40PIN SharedPartial GPIO Interface: Contains One Set of I2C and 2 GPIOs and Power SupplyUPS Module Mini Interface: Uses 10440 3.7V Lithium BatteryBattery Specifications: 3x10440 Li Ion 350mAh (Ship with Inbuilt Battery)