This is STM32F103C6T6 Development Board STM32 ARM Core Module. This board is a low-cost Minimum System Development Board for ARM Microcontroller STM32F103C6T6. Board is suitable for learners that want to learn the STM32 microcontroller with ARM Cortex-M3 32-bit core. Board is suitable for learners that want to learn STM32 microcontroller with ARM Cortex-M3 32-bit core. Specifications: Onboard Mini USB interface, you can give the board power supply and USB communication. 72MHz work frequency 32KB flash memory, 20K SRAM 2.0-3.6V power, I/O Reset(POR/PDR) 4-16MHz crystal 32 kHz oscillator for RTC with calibration Up to 2 x I2C interfaces (SMBus/PMBus) Up to 3 USARTs (ISO 7816 interface, LIN, IrDA capability, modem control) Up to 2 SPIs (18 Mbit/s) CAN interface (2.0B Active)   Package Includes: 1 x STM32F103C6T6 Minimum System Development Board STM32 ARM Core Module