This product is an industrial grade RS485 interface control 8-channel magnetically held relay module, the state of the relay will remain unchanged after power failure, using Modbus RTU protocol, built-in power isolation, magnetic coupling isolation and TVS and other protection circuits, using ABS shell design. This product is easy to operate, with fast communication speed, stability, reliability, safety and other characteristics, can be applied to a variety of high communication requirements of industrial control equipment or applications.<br><br>Colour:Black Material:Aluminum alloy Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use<br><br>Package Contents: 1 * Relay Modules<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.