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AJMRTC SIM808 development board integrates GSM, GPRS and GPS functions, serving as a drop-in replacement for the SIM908 module. It features IPX and SMA dual antenna interfaces and ships with a GPS antenna for convenient assembly. Supporting quad-band 2G cellular networks, this board can send SMS messages, transmit GPRS data and acquire GPS positioning information via standard AT commands. It adopts UART serial communication and works seamlessly with Raspberry Pi, Arduino and other MCUs. The onboard micro SIM holder, real-time clock and lithium battery charging circuit make it ideal for vehicle tracking devices, remote asset monitoring, portable location loggers and IoT alarm projects.