These expansion modules are designed to increase functions of ARS-2610/ARS-2620 & ARS-2510/ARS-2110 box PCs. The standard offerings include 2.5” SSD SATA tray, dual COM port module, dual CAN port module, and MVB port module. For larger-volume orders, users can specify their own customized modules, and build systems that offer powerful, best-fit, custom solutions.