This is a modified pro controller called Firebird. I purchased the board about two weeks ago and have been using it with an octagonal stick guide shell. I use it for Smash Bros., but it can be used for various games. By connecting it to a PC, you can adjust the stick, gyro, and the strength of the return filter, among other settings, to suit your preferences. For more details, please refer to the developer's blog! I've replaced the buttons with non-genuine light blue ones to give it a Hatsune Miku vibe. I've been using the buttons for about two years, so some of the colors are worn, especially on the LR buttons. The controller's exterior, however, has only been used for two weeks, so it's not covered in scratches, but it is a used item, so please refrain from purchasing if you are overly concerned about its condition. It supports HD rumble! Normally, it doesn't come with vibration motors, but I've added them because I like having vibration. This is a specialized product, so I recommend researching it thoroughly before purchasing! ※It also works with Switch 2!