25MHZ high-speed crystal & 32.768Khz 6PF low-speed crystal Flash pads have been reserved, USBDisk&&FATFFS routines are provided The jumper cap does not need to be installed and can be used directly. BOOT0 internal 10K resistor pull-down The breathing light&USBCDC test program has been burned in the factory If the jumper cap cannot be installed, please adjust the direction of the jumper cap. Because the jumper cap is wide on one side and narrow on the other Name: Development board Material: PCB Color: As Shown Package Contents: 4 x Development Board Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.