Brand: Arduino Type: Electronic Accessories This is a RoHS compliant I2C Serial LCD Daughter board that can be connected to a standard HD44780 compatible 162 or 204 Character Display Module that supports 4 bit mode. All Character Modules sold on our site support 4 bit mode, and nearly all commercially available 162 and 204 line character modules support it too. FEATURES: Arduino 1602 I2C interface 4-wire 1602 screenIO port of 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. This module is without LCD 1602. SPECIFICATIONS: Supply voltage: +5 V Supports the I2C protocolWith backlight and contrast adjustment potentiometer4 Line Output easier /.