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This is a breakout board for Particle's B series of cellular IoT modules. It breaks out all of its pins via easy-to-use headers. The board features USB ports for the nRF52840 MCU as well as the cellular modem, SD card connector, Ethernet connector, a barrel jack power connector, buttons, RGB LED, charge status LED, and a connector for a LiPo battery (battery not included).
The B Series SoM is not included; you must purchase the desired SoM separately.
The datasheet can be found here.