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This M.2 BKey to USB3.0 expansion base HAT is specially designed for Raspberry Pi 4 singleboard computers. It comes with a dedicated SIM card slot and supports mainstream 3G/4G/5G cellular modules including RM500Q, RM500U, GM800 and SIM8200. Adopting USB3.0 highspeed transmission, it provides reliable cellular network connectivity for IoT, industrial control, remote monitoring and edge computing scenarios. Compact and easytoinstall, it is an essential expansion accessory for Raspberry Pi 4 5G communication development.