The device is used for connecting Raymarine electronic components together via Raymarines’ Ethernet network, referred to as SeaTalk HS. This device will allow you to connect up to 7 other SeaTalk HS-compatible components on the same network. For example, this would be a good option if you are setting up a network with multiple E-Series displays along with a DSM300 Sonar Module. An additional switch can be connected to this switch if more ethernet ports are needed. 

Comes with switch cover, no cables.