DFRobot Arduino Uno R3 with IO Expansion Shield and USB Cable A-B

Specification : Microcontroller: ATmega328 (DIP Package) Operating Voltage: 5V Input Voltage (recommended): 7 ~ 12V Input Voltage (limits): 6 ~ 20V Digital I/O Pins: 14 (of which 6 provide PWM output) Analog Input Pins: 6 DC Current per I/O Pin: 40 mA DC Current for 3.3V Pin: 50 mA Flash Memory: 32 KB of which 2KB used by bootloader SRAM: 2 KB (ATmega328) EEPROM: 1 KB (ATmega328) Clock Speed: 16 MHz Size: 75 x54 x15 mm (2.95 x2.13 x0.59 #34;) Environment Friendly: Rohs Compliance Shipping List : DFRduino Uno V3.0 x1 Gravity: IO Expansion Shield for Arduino V7.1 x1 USB Cable A-B for Arduino Uno/Mega x1 Documents : ATmega328P datasheet gt; https://image.dfrobot.com/image/data/DFR0216/ATmega328P.pdf Wiki Doc gt; https://www.dfrobot.com/wiki/index.php/IO_Expansion_Shield_for_Arduino_V7_SKU:DFR0265 Schematic gt; https://image.dfrobot.com/image/data/DFR0265/update1406/IO%20Expansion%20Shield%20V7.1%20SCH.pdf