Sony filed a patent for its PS4 Back Button Attachment accessory
Wireless Xbox Back Button Attachment for Xbox Series S/X Controller, Controller Paddles Strike Pack for Xbox Series S/X/Xbox One/PS4/Switch/PC, Motion Control/Turbo/Macro/Audio (Pro Version) Black : Amazon.com.au: Video Games
How to Use PS4 DualShock 4 Back Button Attachment (Is This Cheating?) - YouTube
DualShock 4 Back Button Attachment review - Polygon
ECHTPower PS4 Back Button Attachment Controller Adapter, Programmable Button Triggers for PS4 Controller, LED Display Screen, Audio Jack, Auto Turbo, 2 Paddles for Professional F.P.S Gaming : Amazon.com.au: Video Games
FINALLY!! PS4 Back Button Attachment Review - YouTube
Dualshock 4 Back Button Attachment : Amazon.com.au: Video Games
PS4 Back Button Attachment: Is It Worth It? - YouTube
PlayStation DualShock 4 Back Button Attachment Review: An Awesome Upgrade | Digital Trends
DualShock 4 Back Button Attachment for PS4 review
PlayStation 4 DualShock finally has cost-friendly back buttons: Review | Mashable
PS4's Back Button Attachment Is Impressive, Comfortable, and May Tease the PS5 - IGN
AOLION Extended Gamepad Back Button Joystick Rear Back Button Attachment with Turbo Key for Playstation 4 for PS4 Gamepad Game Controller | Catch.com.au