Article 50% cheaper than the lower model arduino uno. The arduibi ATmega2560 has more numerous interfaces: for example, from 14 I / O to 54, 6 inputs to the 16, passes 256KB flash memory instead of 32 KB. This card also has the I2C and SPI. And especially for trying the 2 code download times in the card is greatly reduced. This card is compatible with uno projects, do not hesitate! Note: The USB cable is very short (about 50 cm)