What is the point of the big black button on the PlayStation 4 controllers? - Quora
Buy DUALSHOCK®4 Wireless PS4™ Controller: Jet Black | PlayStation® (US)
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Best Buy: Sony DualShock 4 Back Button Attachment Black 3004784
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PS4 Controller Buttons - Red Chrome - 13 in 1 Button Set - Consoleskins
Sony's $30 Attachment for PS4 Controller Allows Customization
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Amazon.com: Sony Dualshock 4 Back Button Controller Attachment (PS4) : Video Games
Sony DualShock 4 Back Button Attachment - For PS4 - Walmart.com
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![Amazon.com: DualShock 4 Wireless Controller for PlayStation 4 - Jet Black [Old Model] : Video Games](https://m.media-amazon.com/images/I/71uQYNKiKCL._AC_UF1000,1000_QL80_.jpg "Amazon.com: DualShock 4 Wireless Controller for PlayStation 4 - Jet Black [Old Model] : Video Games")