Description:  This is another great IIC/I2C/TWI/SPI Serial Interface. As the pin resources of controller is limited, your project may be not able to use normal LCD shield after connected with a certain quantity of sensors or SD card. However, with this I2C interface module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, this LCD module actually cost no more resources at all. It is fantastic for based project.  I2C Address: 0X20~0X27 (the original address is 0X20, you can change it yourself).  the backlight and contrast is adjusted by potentiometer.  Come with 2 IIC interface, which can be connected by Dupont Line or IIC dedicated cable.  I2C Address: 0x27 (I2C Address: 0X20~0X27 (the original address is 0X27, you can change it yourself).     Specification:  Compatible for 1602 LCD.  Supply voltage: 5V.  Size: 5.5 x 2.3 x 1.4cm.     Package included:  5 x IIC/I2C/TWI/SPI serial interface module