The PlayStation DualShock 4 controller gets three extra tactile buttons! - Yanko Design
eXtremeRate Multi-Colors Luminated D-pad Thumbstick Trigger Home Face Buttons, Black Classical Symbols Buttons DTFS (DTF 2.0) LED Kit for ps4 Slim for ps4 Pro Controller - Controller NOT Included : Amazon.co.uk: PC
PS4 Controller Programmable Back Button Attachment Announced by Sony
PS4 PRO Modded Controller - XMOD 4 Back Buttons -Remap, Scuf, modchip – XMOD ELECTRONICS