1、Simple structure design, occupy less space of computer case. And the size of screw hole position and diameter is conform to industry standards. 2、USB1 GEN2 high speed connecting line conductor is using tinned copper material, improving the transmission stability by adding three layer shield. 3、The audio port is adopting HDAudio scheme, which bring you comfortable experience of high fidelity audio. Compared with AC97 of computer case, it has large transmission bandwidth, high playback accuracy and stronger interference immunity. 4、Reasonable placement of panel interface, ensuring each device can be inserted normally. Lightweight galvanized steel sheet is anti-oxidation, anti-corrosion and long lasting. Sandblasting panel and chassis overall coordination. 5、Used for desktop computer host to extend front l/0 interface by idle optical drive bit, convenient for the connection of peripheral USB and audio device plug and unplug, upgrade the high-speed transmission of DIY computer case. Features: 1. Simple structure design, occupy less space of computer case. And the size of screw hole position and diameter is conform to industry standards.  2. USB 3.1 GEN2 high speed connecting line conductor is using tinned copper material, improving the transmission stability by adding three layer shield.  3. The audio port is adopting HDAudio scheme, which bring you comfortable experience of high fidelity audio. Compared with AC97 of computer case, it has large transmission bandwidth, high playback accuracy and stronger interference immunity.  4. Reasonable placement of panel interface, ensuring each device can be inserted normally. Lightweight galvanized steel sheet is anti-oxidation, anti-corrosion and long lasting. Sandblasting panel and chassis overall coordination.  5. Suitable for desktop computer host to extend the front l/0 interface by unused optical drive bit, convenient for peripheral USB and audio device plug and unplug connection, DIY upgrade the high-speed transmission of computer case.  Specification: Condition:100% Brand New Material: aluminium alloy Color: As Pictures Shown Interface: 2*USB 3.1, 2*USB 2.0, 1*type-c, 2* audio port Cable Length: approx. 0.8m/ 2.6ft    Package list:  1 * CD driver Panel 1 Bag of Screws  2 * Connecting Cable Note:  Please correctly distinguish the size of the host optical drive bit and the floppy drive bit. The optical drive bit is generally located at the top of the host; The floppy drive position is generally located in the central position of the host, otherwise it will not be able to be normally installed and used.