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Sony's new PlayStation 4 Back Button is a great add-on to your controller
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Best Buy: Sony DualShock 4 Back Button Attachment 3004784
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Personalized Custom Playstation PS4 Controller Back Sticker | Etsy
Sony's new PlayStation 4 Back Button is a great add-on to your controller
Good news! The PS4 controller's Back Button Attachment works on iOS. | iMore
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PlayStation 4 DualShock finally has cost-friendly back buttons: Review | Mashable