The DualShock (officially DUALSHOCK an occasionally referred to as Dual Shock) is a line of vibration-feedback gamepads by Sony for the PlayStation, PlayStation 2, and PlayStation 3video game consoles. The DualShock was introduced in Japan in late 1997, and launched in America in May 1998, meeting with critical success. First introduced as a secondary peripheral for the original PlayStation, a revised PlayStation version came with the controller and subsequently phased out the digital controller that was originally included with the hardware, as well as the Sony Dual Analog Controller.