Specification: _x005f_x000D_ Color: Blue _x005f_x000D_ Chip: MAX490 _x005f_x000D_ Module size: 5.0cm * 2.7cm/1.97 * 1.06in _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Note: _x005f_x000D_ Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! _x005f_x000D_ Please allow 1-2cm measuring deviation due to manual measurement. _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Included: _x005f_x000D_ 1 x Module 1. Two-way Communication: RS422 interface, two-way communication. A B Y Z ultra long distance transmission 1000 meters. 2. Enhanced Protection: With built-in 15KV ESD protection and a 10-ohm current-limiting resistor, this module offers robust protection against electrostatic discharge and overcurrent situations. It ensures the safety and longevity of your devices. 3. TVS Diode: Equipped with a TVS diode, this module provides excellent resistance to thunder strikes and voltage spikes. The inclusion of a 120-ohm termination resistor effectively reduces long-distance communication reflect interference. 4. Convenient Indicator Light: The module features power indicator and data transmission indicator, allowing for easy visual monitoring of the module's status. Additionally, module TTL side uses 5v DC power supply RXD TXD compatible with 5V logic signal.