We produce this board based on the open-source arduino official schematics.The printing or color on the board may be different from each production date, but the function is exactly the same.
Digital I/O Pins:54 (of which 14 provide PWM output).
Flash Memory:256 KB (ATmega2560) of which 4KB used by bootloader.
This board is compatible with current boards and shields, but adds possibilities for new shields.
Analog Input Pins:16, Input Voltage (recommended):7-12V and Input Voltage (limits):6-20V.

Technical Details

Size (LWH): 4.7 inches, 3.3 inches, 1.1 inches
Product Details
Product Dimensions: 4.7 x 3.3 x 1.1 inches
Shipping Weight: 0.02 pounds (View shipping rates and policies)
ASIN : B00OH21CRM