Description: Model: STM32F103C8T6. Core: ARM 32 Cortex-M3 CPU. Debug mode: SWD. 72MHz work frequency. 64K flash memory, 2.0-3.6V power, I/O. Reset(POR/PDR). 4-16MHz crystal. On-board Mini USB interface, you can give the board power supply and USB communication. Size: Approx. 55*20*10mm Package Includes: 1x STM32 ARM Minimum System Board