Utilizing multi-layer circuit boards for lossless transmission of USB3.0 high-speed signals. Ensures high-speed signal transmission without loss. Addresses the issue where the 19p cable, when directly inserted into the motherboard, is not small enough to avoid damaging the motherboard pins. For the 19P interface on the motherboard, choose option B. Type: computer motherboard adapter Interface: USB3.0 Colour: black Material: plastic Package Contents: 2 x Adapter Only the contents listed above are included, other products are not part of the package. Note: Light reflection and varying displays may cause the color of the item in the picture to differ slightly from the actual product. Measurement error allowed is +/- 1-3cm.