Arduino IIC/I2C interface was developed to reduce the IO port usage on Arduino board I2C adapter allows flexibility in connections I2C Reduces the overall wirings. 16 characters wide, 2 rows Black text on the Green background Single LED backlight included can be dimmed easily with a resistor or PWM. Interface: I2C Interface Address: 0x27 Character Color: Black Backlight: Green Supply voltage: 5V