Eight identical RJ45 shielded modular sockets are provided. Use one at a time, or up to eight simultaneously. Mix one of these boards with any other CB board on the other side to test octopus and other multi-headed cables. Graphic image for two or more connectors shows a group of eight RJ45 images. Compatible with Model M2 (Item 811) and Model M3 (Item 821) only. Set of two boards with expander cable.