Features: 72MHz work frequency. 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. Package Included: 2Pcs NOYITO STM32F103C8T6 ARM STM32 SWD Minimum System Board NOYITO STM32F103C8T6 board program ?schematic and dimension drawing Download https://1drv.ms/u/s!AlzQUCOyZQhKgUbHcYNtw8odY9pn?e=BywdqY