Components: Blue 16x2 1602 lcd display + I2C serial interface backpack; 1602 lcd screen can display 2-lines x 16-characters with built-in industry standard HD44780 equivalent LCD controller.

Default Address: 0x27 for PCF8574T chip; 0x3F for PCF8574AT chip; please check which chip you have on i2c interface. (Before you upload the code to the control board, please download the LiquidCrystal_I2C library)

Four Pins: VCC, GND,SDL and SCA used for connecting Dupont Line or IIC dedicated cable.

Compatibility: used for connecting Arduino and Raspberry pi and it can be used to display real time clock, temperature, humidity etc. (A potentiometer is also necessary to adjust the contrast. Working Voltage: Only 5V )

Wide Application: Commonly used in copiers, fax machines, laser printers, industrial test equipment and networking equipment such as routers and storage devices.