Specification: Display: 2-lines x 16-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 for PCF8574T chip; 0x3F for PCF8574AT chip Working Voltage: 5VPackage: 1 pack blue 16x2 1602 lcd display + I2C serial interface