Features: For R3 development board is a powerful electronic prototyping board with USB cable for easy connection to PC for programming and debugging. For R3 development board use ATmega328P microcontroller with a rich set of input and output interfaces to support connection of multiple sensor and module. Easy for users to write and uploading code. For R3 development board can be widely used in IoTs, robot, automations control and other field Users can make use of its rich interfaces and functions to realise development of various electronic prototypes. Specifications: 1tem：for R3 Development Board Size:about 6.8×5.3×0.50cm/2.68x2.09x0.2inch Package Types: with USB Cable/Without USB Cable Package Includes: 1PC For R3 Development Board note: Due to the problem of lighting effects and shooting, there will be tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.