Features: Brand new and high quality PLC expansion board 16 channel input can remotely control 16 channels of output of another board via RS485 bus Widely used in PLC IO expansion board, home automation, PTC camera, identification system, LED light driver and automatic curtain control 16 input 16 output expansion board with strong functionality, can meet your uisng requirement The 16 channel expansion board circuit has been repeatedly debugged, the wiring is simple and there is little interference, convenient to use Crafted with high quality materials, ensuring durability and reliability for long term use. Specifications: Material:PCB Type:A/B A:Approx.120x88x42mm/4.72x3.46x1.65inch B:Approx.100x72x20mm/3.93x2.83x0.78inch Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Remote Switches