85mm*56mm, Credit-card-sized High Performance Board ^^ 4*USB HOST, 1*HDMI Out, 1*Micro USB, 1*UART, 1*GPIO interface, WiFi and 100M LAN interface, Support Micro SD card ^^ Rockchip RK3128 with Quad-core Cortex-A7 up to 1.2GH z ^^ 40 Pin header enables hardware re-use by maintaining compatible alternate pin functions like I2S, I2C, PWM, UART, and GPIO. Form-factor compatible with Raspberry Pi 3 for easy migration. ^^ Form Factor & GPIO Compatibility with Raspberry Pi for Maximum Re-usability