CPU: Allwinner H3, Quad-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. Camera: OV5640 Button: GPIO Button USB Host: 2.54mm pin x2, exposed in 2.54mm pitch pin header Micro-SD Slot x 1 Micro-USB: 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 pitch 16pin. Includes UART, SPI, I2C, Audio, etc. GPIO2: 2.54mm pitch 16pin. Includes USB, 10/100M Ethernet, IO, etc. PCB Dimension: 25.4 x 55mm Power Supply: DC 5V/2A Temperature Measurement Range: -40 to 80 OS/Software: U-boot, Linux 4.11.2 (mainline), 16.04.2 (Xenial) Color: Black Material: PCB+Metal Package Contents: 1 x Nano pi Duo2 Development Board 2 x 16pin single row pin header 1 x Antenna 1 x Micro-USB cable Only the above package contents are included; other products are not. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3cm.