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.Micro USB connector , you can give the board power supply and USB communication.Size:5.3cm x 2.2cm.
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1PCS STM32F103C8T6 ARM STM32 Minimum System Development Board Module For Arduino