Support motherboard: For development board, in-line connection Expansion board interface: pin interface, steering gear interface 4, SPI interface, IC row port.2.IC row pin interface x2, serial row pin interface 2, serial row port x2.SWD debugging interface, 3.3V power supply interface, 5V Power supply interface Power supply mode: development board power supply Protection scheme: overcurrent protection and short circuit protection Application areas: sensor experiment, External device extension, Robot project<br><br>Steering gear interface: 4-way 5V steering gear interface Dedicated interface: development board interface Onboard indicators: power indicator, 3.3V indicator, 5V indicator size:95 x 58MM Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Material: PCB colour: black<br><br>Package Contents: 1 x Expansion Board<br><br>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.