This is a great IIC I2C interface module.
The pin resources of Arduino controller is limited.
But with this I2C interface module, you can realize data display though two wires.
This Module actually cost no more resources at all, It is a surprise for Arduino based project.
Arduino IIC I2C interface
LED 1602/2004 adapter board (not included LED screen)
Pin Definition : GND,VCC,SDA,SCL
Supply voltage: 5V
Compatible for 1602 LCD 2004 LED
Package included:1x PCF8574T module
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.