Technical info: https://pan.baidu.com/s/1TQp5E7aQuOlFTWHSUn0qyw

Product description:

1.On-board STM32F103VBT6 chip.

2.On-board JTAG interface and reset button.

3.On-board 32.768KHZ and 8MHZ crystal.

4.With 5V to3.3V chip AMS1117-3.3.

5.With a grout RS232 serial, UART1 and UART2 can set by jumper.

6.All I/O are leaded out and marked.

7.Support USB power supply and power supply JLink Power On.

8.Size: 71(mm) x 99(mm).