Iic /I2c /Twi 2004 20x4 Character Lcd Module Display for Arduino Blue Serial

Specification: Display: 4 lines x 20 characters Backlight: Blue with white character color LCD controller: HD44780 Pin Definition: VCC/ GND/SDL and SCA Contrast Adjust: Potentiometer Backlight Adjust: Jumper Default Address: 0x27, 0x3F Working Voltage: 5V Size : 82x35x18 mm Package include: IIC/I2C/TWI 2004 20x4 LCD Display Features: Support I2C protocol I2C Address: It's either 0x27 or 0x3F Received an email from a customer saying that his board works with 0x3F Pin Definition : GND、VCC、SDA、SCL Back light (Blue with White char color) Contrast Adjust : Potentiometer