This is IIC Serial 20X4 LCD module . With this I2C interface LCD 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 Arduino based project.
Interface: I2C
I2C Address: 0x20 or 0x3F
SDA (DATA) -> analog input pin 4
SCL (CLOCK) -> analog input pin 5
Pin Definition : GND?VCC?SDA?SCL
Back lit (Yellow with black char color)
Supply voltage: 5V
Pcb Size : 60mm×98mm
Contrast Adjust : Potentiometer
Backlight Adjust: Jumper