The module is a high-quality 2 line 20 character LCD module with I2C interface and it is a basic character LCD screen for lots of applications.
It is compatible with Arduino boards and it can be used to display real time clock, temperature, humidity, ect.
Its backlight can help you to read the screen clearly in the dark environment.
Interface: I2C. IIC
Pin Definition : GND, VCC, SDA, SCL.
Back lit (Blue with White char color).
Supply voltage: 5V.
Pcb Size : 60mm x 99mm.
Contrast Adjust : Potentiometer.
Backlight Adjust : Jumper.
Sample code/libraries https://arduino-info.wikispaces.com/LCD-Blue-I2C (make sure to change address from 0x27 to 0x3F in sketches)
Package included :
1 x Blue Serial IIC I2C TWI 2004 20×4 Character 5v LCD Module Display Screen for Arduino.