Add a DB9 serial port to the rear panel of the computer The PLATE9MHD 9pin Serial Male to 10pin IDC Motherboard Header Slot Plate Adapter adds a DB9 serial port to the rear panel computer rear panel, connecting to the host computer motherboard using a mini style header connector (required by motherboards such as the Intel DG41). * Connects to your motherboard & adds an additional DB9 serial port to the back of your PC * Backed by Star Tech.com's lifetime warranty