The DualShock (trademarked as DUALSHOCK or DUAL SHOCK) is a line of vibration-feedback gamepads by Sony for PlayStation consoles and devices. The DualShock was introduced in Japan in late 1997, and launched in the North American market in May 1998. First introduced as a secondary peripheral for the original PlayStation, a revised PlayStation version came with the controller and Sony subsequently phased out the digital controller that was originally included with the console, as well as the Sony Dual Analog Controller. As of June 2008, over 28 million controllers have been sold in the DualShock line (excluding bundled controllers).