This includes 2 covers for the connectors on the back of your HDS 12 and 16 Live units. There is one cover for the HDMI port and one for the USB port. Lowrance doesn't offer a replacement part for the caps that come with the units so these act as a replacement. These are very important to keep on the unit to prevent water intrusion and rusted connectors.
***These work on the usb and HDMI connector for HDS 12 and 16 Live ONLY