Sony's new PlayStation 4 Back Button is a great add-on to your controller
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Sony DUALSHOCK 4 Back Button Attachment
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DualShock 4 wireless controller
Amazon.com: TERIOS Wireless Controller Compatible with PS4/PS4 Pro/PS4 Slim, Pro Controller with Built-in Speaker, Advanced Buttons Programming, Enhanced Dual Vibration/Turbo Auto Fire (Black) : Video Games
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How to REMAP ANY PS4 BUTTON with CUSTOM BUTTON ASSIGNMENTS (Accessibility Option) - YouTube
PlayStation 4 Controller Buttons - A Beginner's Guide - Gamercreatrix