Brand new and high quality.Model: STM32F103C8T6.Core: ARM 32 Cortex-M3 CPU.Debug mode: SWD.72MHz work frequency.64K flash memory， 20K SRAM.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:53.34mm x 22.86mm.Package Included:1 x STM32F103C8T6 Board