●LCD screen can display 2-lines x 16-characters, working voltage: 5V; to come with a potentiometer, which is applied to adjust backlight and contrast. ●Less I/O ports are occupied, only four - VCC, GND, SDA (serial data line), SCL (serial clock line), how to wire: GND—GND; VCC—VCC; SDA—A4; SCL—A5, LCD display module blue with white color. ●Support IIC protocol. The I2C LCD1602 library is provided, so you can call it directly used to adjust backlight and contrast. ●Application: LCD module is applied to display characters, letters, numbers, real time clock and temperatur. ●1602 LCD display with I2C serial interface is compatible with for Arduino and Raspberry pi, display function: LCD display with I2C serial interface can be applied to display real time clock, temperature, humidity and so on.