Adapter USB PIN 9PIN This USB pin header can be plugged to a free USB pin header male of your mainboard in order to expand your system internally by 2 USB-A ports. Thus you can use e.g. connect an USB memory stick or USB-WLAN stick. Based on the mainboard, both USB ports are aligned upwards and stacked. Specification 9 pin 2.54 mm pin header female For 2 x USB 2.0-A female directly on the mainboard USB Port direction: upwards, stacked