With this LCD backpack you can add an I2C / IIC communication interface to your 1604 or 2004 LCD. - Supply voltage: 2.5 ... 6 V - supports the I2C protocol - Cascading of up to 8 modules - Setting the device address (A0 / A1 / A2) - Backlight Enable/disable - Contrast adjustment possible - Dimensions (LxWxH): 41.5 x 19 x 15.3 mm