LCD1602 1602 LCD Display Module Blue Yellow Green Screen 16x2 Character PCF8574T PCF8574 IIC I2C Interface 5V for Arduino  R3 Notice: There are two types of LCD Display Module,one with I2C Module,the other one without I2C Module(only comes with LCD Display Module) 1602 LCD: LCD display module with blue blacklight. Wide viewing angle and high contrast. Built-in industry standard HD44780 equivalent LCD controller. Commonly used in: copiers, fax machines, laser printers, industrial test equipment, networking equipment such as routers and storage devices. LCM type: Characters Can display 2-lines X 16-characters. Voltage: 5V DC. Module dimension: 80mm x 35mm x 11mm. Viewing area size: 64.5mm x 16mm IIC/I2C : for Arduino 1602 I2C interface 4-wire 1602 screen IO port for Arduino control board is only 20,so IO ports is not enough for many sensor, SD card, relay modules. The original 1602 screen need 7 IO ports to drive up, and this module can save 5 IO ports