LCD display with blue backlight. Since the pin resources of the Arduino controller are limited, your project may not be able to use the regular LCD shield after connecting to a certain amount of sensors or an SD card.

However, with this I2C interface LCD module, you will be able to display data using only 2 wires. If you already have I2C devices in your project, this LCD module actually doesn't cost more resources. It's fantastic for an Arduino-based project.