This is MAX485 IC based low power RS-485 Module for serial communication; range of communication could be as long as 1200 meters over cable (range can be greatly increased by using repeaters). The operating voltage for this module is 5V and it uses 5V logic, making it convenient to interface with Arduino and other MCU/Boards supporting 5V logic. It allows communication between 2 or more modules.
Standard 0.1” pitch header is used for Data Connectors making it convenient to use with breadboards or solder it into prototyping PCB. Screw Terminals can be used to connect Data Cables. The board size is 44 x 14mm.