The NanoPi Duo2("Duo2") it is only 55 x 25.4mm. It features Allwinner -core A7 processor H3, and has 512M DDR3 RAM, onboard WiFi & bluetooth module and an OV5640 camera interface. It works with Linux variants such as Core. The NanoPi Duo2 is and compact with interfaces and ports. It takes power input from MicroUSB port and can be booted from a SD card. It works with general bread-boards. Interface pins such as USB, SPI, UART, I2C, PWM, IR, audio input & output and Fast Ethernet etc are populated. The NanoPi Duo2 supports software utilities such as WiringNP and Python etc. These are all . It is suited for IoT applications. Hardware Spec CPU: Allwinner H3, -core -A7 Up to 1.2GHz DDR3 RAM: 512M Connectivity: 10/100M Ethernet WiFi: 802.11b/g Bluetooth: Bluetooth V4.0 of 1, 2 and 3 Mbps. Key: GPIO Key USB : 2.54mm pin x2, exposed in 2.54mm pitch pin header For SD Slot x 1 MicroUSB: OTG and power input Debug Serial Interface: exposed in 2.54mm pitch pin header Audio input/output Interface: exposed in 2.54mm pitch pin header GPIO1: 2.54mm spacing 16pin. It includes UART, SPI, I2C, Audio etc GPIO2: 2.54mm spacing 16pin. It includes USB,10/100M Ethernet, IO etc PCB Dimension: 25.4 x 55mm Power Supply: DC 5V/2A Temperature measuring range: -40 to 80 OS/Software: U-,Linux 4.11.2 (mainline) , 16.04.2 (Xenial) Material: PCB colour: Random Color Note: Random color, 't accept the specified color. Package Contents: 1 x Nano Duo2 2 x 16pin single-row pin header 1 x Antenna Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.