The NanoPi Duo2("Duo2") it is only 55 x 25.4mm. It features Allwinner quad-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 Ubuntu Core.The NanoPi Duo2 is tiny and compact with interfaces and ports. It takes input from its 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 open source. It is suited for various IoT applications.Hardware SpecCPU: Allwinner H3, Quad-core Cortex-A7 Up to 1.2GHzDDR3 RAM: 512MConnectivity: 10/100M EthernetWiFi: 802.11b/gBluetooth: Bluetooth V4.0 of 1, 2 and 3 Mbps.Key: GPIO KeyUSB Host: 2.54mm pin x2, exposed in 2.54mm pitch pin headerFor SD Slot x 1MicroUSB: OTG and inputDebug Serial Interface: exposed in 2.54mm pitch pin headerAudio input/output Interface: exposed in 2.54mm pitch pin headerGPIO1: 2.54mm spacing 16pin. It includes UART, SPI, I2C, Audio etcGPIO2: 2.54mm spacing 16pin. It includes USB,10/100M Ethernet, IO etcPCB Dimension: 25.4 x 55mm Supply: DC 5V/2ATemperature measuring range: -40 to 80OS/Software: U-boot,Linux Kernel 4.11.2 (mainline) , Ubuntu 16.04.2 (Xenial)Material: PCBcolour: Random ColorNote: Random color, don't accept the specified color.Package Contents:1 x Nano pi Duo22 x 16pin single-row pin header1 x AntennaOnly the above package content, other products are not included.Note: Light 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.