Features 1、This adapter solves problem that IO port is not enough when connecting sensor, card or relay modules to control board. 2、Original 1602 display need 7 IO port to drive, while this adapter can save 5 IO port for you. 3、It supports I2C protocols, designed with IIC/I2C port. 4、Designed with backlight and contrast ratio adjustment potentiometer. 5、Convenient to use, 4-wire output is more simple. Specification Features: This adapter solves problem that IO port is not enough when connecting sensor, card or relay modules to control board. Original 1602 display need 7 IO port to drive, while this adapter can save 5 IO port for you. It supports I2C protocols, designed with IIC/I2C port. Designed with backlight and contrast ratio adjustment potentiometer. Convenient to use, 4-wire output is more simple. Specifications: Device Address: 0x20 Size: 5.2*2.4cm/2.05*0.94in Weight: 5g(approx.) Package Includes: 1 x Adapter Board Package List