Ars calculates the size of the DualShock 4 touchpad: about 2.1” x 1” | Ars Technica
Wireless Gaming Controller for PS4/Playstation 4/PC Windows 10/8/7,PS4 Gamepad Joystick,Wireless Bluetooth Controller PC Controller with Touch Pad,Dual Shock Vibration,6-Axis Gyroscope,Black/Red PS4 Accessories - Newegg.com
Is it possible for a PlayStation®5/PlayStation®4 controller to function as a mouse? | UI Guide | FINAL FANTASY XIV, The Lodestone
How to fully test your ps4 controller including touchpad, vibration, motion sensor and speaker - YouTube
Wireless Game Controller Compatible with Playstation 4 System, for PS4 Console with Touch Pad/LED Indicator/charging cable/Stereo Headset Jack - Walmart.com