and high quality! STM32F103C8T6 ARM STM32 Minimum System Development Board Module For Model: STM32F103C8T6 Core: ARM 32 - CPU. 72MHz work frequency. 64K flash memory, 20K SRAM. 2.0-3.6V power, I/O. Reset(POR/). 4-16MHz crystal. Size: 5.3cm x 2.2cm color:Blue Material:PCB Package Contents: 5 x STM32F103C8T6 Minimum System Development Board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.