Short answers, pulled from the story.
Sony Interactive Entertainment introduced the DualShock Analog Controller in November 1997. The device carried model number SCPH-1200 and arrived as a secondary peripheral for the first PlayStation console.
The name DualShock derives from its dual vibration motors housed within the handles. Engineers made the left motor larger and more powerful than the right one to allow varying levels of vibration feedback.
Teiyu Goto designed the face buttons using simple geometric shapes: a green triangle, red circle, blue cross, and pink square. These symbols represented yes and no concepts common in Japanese culture for confirm and cancel actions.
The DualSense was unveiled on the 7th of April 2020 as the PlayStation 5's primary input device. This model introduced vibrotactile haptic feedback using voice coil actuators in palm grips.
Engineers implemented pressure-sensitive buttons on the DualShock 2 Analog Controller that could sense 256 levels of pressure while remaining lighter than previous models. The specific model numbers for this device are SCPH-10010 or SCPH-97026.