Debug Serial Port: 4Pin, 2.54 mm pitch pin header GPIO1: 2.54mm pitch 24pin. It includes UART, SPI, I2C, IO etc GPIO2: 2.54mm pitch 12pin. It includes USB, IR, SPDIF, and I2S PCB Dimension: 40 x 40 mm Power Supply: DC 5V/2A OS/Software: u-boot, -Core-Xenial, Debian- colour:blue Material:plastic Package Contents: 8 *NanoPi-NEO H3 Development Board 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.