100% Brand new and high quality! STM32F103C8T6 ARM STM32 Minimum System Development Board Module For arduino Specifications: Model: STM32F103C8T6. Core: ARM 32 Cortex-M3 CPU. 72MHz work frequency. 64K flash memory, 20K SRAM. 2.0-3.6V power, I/O. Reset(POR/PDR). 4-16MHz crystal. Size: 5.3cm x 2.2cm Can be used with your favorite STM32 IDE + ST-Link V2 to directly program and debug in-system. Or can be used with the Auduino IDE and CH340/PL2303 USB-Serial converter. See here for some instruction: http://grauonline''de/wordpress/?page_id=1004 Programing using usb port https://medium.com/@paramaggarwal/programming-an-stm32f103-board-using-usb-port-blue-pill-953cec0dbc86