This is a back button attachment for PS4 controllers. By attaching it to a standard DualShock 4, you can assign two additional buttons to the back, allowing for more comfortable and faster operation. It's perfect for playing fighting games, FPS games, and more. Product Condition: ・Operation confirmed ・Overall in good condition, but there are minor scratches from normal use. ・Only the main unit shown in the photos is included. This is a convenient item that improves the operability of PS4 gamers. Please consider it.