it is a highly integrated SOC development board with ceramic antenna and high performance BDS/GNSS multi-mode satellite navigation receiver. The main chip is AT6558R satellite positioning chip. Integrated radio frequency front end,digital baseband processor,32-bit RISC CPU,power management and active antenna detection and protection functions. Support a variety of satellite navigation systems,including China's BeiDou Navigation Satellite System (BDS),the United States' GPS,and Russia's GLONASS,which can realize multi-system joint positioning. it follows the NMEA protocol and sends instructions through serial communication to control the work content of the development board. Colour:Black Material:PC type:GP-02-Kit Package Contents: 4 x Modules(Due to different product batches, the appearance may vary, which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.