The DUALSHOCK 4 Back Button Attachment (CUHJ-15017) is an official accessory that enhances the operability of the PlayStation 4 wireless controller "DUALSHOCK 4." This product features two back buttons, and you can assign any button function of the DUALSHOCK 4 to each button. This allows you to perform complex operations without taking your thumbs off the sticks, improving reaction speed and play accuracy. In addition, the central organic EL display shows the currently assigned button settings, allowing for easy confirmation and customization at a glance. You can save up to three profiles and quickly switch between them to match the game you are playing. The DUALSHOCK 4 Back Button Attachment is the perfect accessory for gamers seeking comfortable and intuitive operation. Works perfectly.