The DUALSHOCK®4 Back Button Attachment was designed to deliver more versatility and performance when gaming while maintaining the comfort and feel of the DUALSHOCK®4 wireless controller you’ve come to love. Sleek design and two back buttons map-able to any digital button on the controller, while a high-fidelity OLED display provides clean cut information. Learn more at https://www.playstation.com/en-us/explore/ps4/accessories/dualshock-4-back-button-attachment/
