1、High quality 2004A LCD screen module, blue back light and white char color, clear showing 2、IIC bus control, which takes only two IO ports 3、Backlight could be controlled through jumper wire or through program 4、Screen display contrast is adjustable by adjusting the screw of blue part 5、The input voltage of this module is 5V and , I2C address is 0x27 Features: High quality 2004A LCD screen module, blue back light and white char color, clear showing. IIC bus control, which takes only two IO ports. Backlight could be controlled through jumper wire or through program. Screen display contrast is adjustable by adjusting the screw of blue part. The input voltage of this module is 5V, and I2C address is 0x27. Specifications: Interface: I2C I2C Address: 0x27 Pin Definition: GND, VCC, SDA, SCL Back Lit: Blue with White char color Supply Voltage: 5V Contrast Adjust: Potentiometer Backlight Adjust: Jumper Application: for Arduino VSS Ground for Logic (0V) VDD Power supply for Logic VO Power supply for LCD RS H: Data; L: Instruction R/W H: Read; L: Write E Enable signal DB0-DB7 Data Bus Line A Backlight Power (+5V) K Backlight Power (0V) Note: This item requires certain professional knowledge and ability, please make sure you know how to use it. We do NOT provide any explanation, modification on test program or any other technical services for this item. Package Includes: 1 x LCD Module