DescriptionRagino yun shield is one of the most powerful shields for Arduino Board. Dragino yun shield is designed to solve the internet connectivity and storage issue for Arduino Board. Dragino Yun Shield Runs Open Source Openwrt System (Same System as Runs in Arduino Yun) and It is fully compatible with Arduino Ide v1.5.4 or Later. Dragino yun shield is the ideal choice for Arduino projects which is require various internet connections and more storage. Basically, Dragino Yun Shield + Leonardo equally to the official Arduino yun, but dragino yun shield is more flexible because work with other Arduino Board Such as Uno, Duemilanever, Mega. And dragino yun shield uses external wifi antenna which provides stability and possibility for various environment. Featuresopen Source Linux (OpenWRT) Inside Low Power Consultable Compatible with ARDUINO IDE 1.5.4 or Later, User Can Program, Debug Or Upload Sketch to Arduino Board Via Arduino Ide. Managed by Web Gui, SSH VIA LAN OR WiFi Software Upgradable Via Network Built-In Web Server Support Internet Connection Via Lan Port, WiFi or 3G Dongle. Support usb flash to provide storage for Arduino projects Failsafe Design Provides Robustly System. Compatible with Arduino Leonardo, Uno, Duemilanove, Diecimila, Mega SpecificationsProcessor: 400MHz, 24K MIPS Flash: 16MBYTES RAM: 64MBYTES POWER INPUT: 4.75V ~ 23V VIA ADUINO VIN 1 X 10M/100M RJ45 or 150m wifi 802.11 b/g/n External Antenna Via i-Pex Connector 1 X USB 2.0 Host Connector, Used for USB Storage or 3G Connection 1 X Reset Button Compatible with 3.3V or 5V I/O Arduino Documentsquick Start Guideuser Manualdatashet. cefirmware download