Satisfaction Guarantee: If you encounter any problems in the use of welcome to consult with us, we are happy to solve all your troubles, please rest assured that the purchase The LCD2004 with an I2C port is developed to solve the multiple IOs problem. It is a high-performance serial bus with bus rules and high-speed or low-speed device synchronization required for multi-master systems. The I2C bus has only two bidirectional signal lines, a serial data line (SDA) and a serial clock line (SCL). Specification: Dimensions (LxWxH): Approx. 41.5 x 19 x 15.3mm/ 1.63 x 0.75 x 0.6 inch Weight: Approx. 5g Display: 2 lines x 16 characters Backlight: with blcak character color LCD controller: HD44780 Features: Low power consumption, easy to use Pin Definition: VCC/ GND/SDL and SCA Contrast Adjust: Potentiometer Backlight Adjust: Jumper Default Address: 0x27, 0x3F Working Voltage: 5V How to wire: GND—GND; VCC—VCC; SDA—A4; SCL—A5 Application: Used to display Characters, letters and Numbers Compatible with banana Pi, Tinker Board, STM32, ESP32 etc. Package Included: 2 x 2004 LCD Display Module 2 x IIC/I2C/TWI Serial Interface Adapter Allinan: We aim to make your work Easier & Funnier!