LCD display module works great compatible with Arduino / Mega2560 board and other micro-controllers. IIC/I2C interface, only takes two I/O ports thus saving more for other usages. You can adjust the contrast by the potentiometer at its back. If you don’t want the back light, you can also unplug the jumper cap at the LCD back. Less I/O ports are occupied, only four - VCC, GND, SDA (serial data line), SCL (serial clock line), address of the module: 0x27 or 0x3F. This kit contains 3pcs IIC/I2C/TWI serial interface adapter, you can start your project at any time. I2C LCD 2004 display 20 characters in one row, 4 rows can display 80 characters.