The PS One (officially stylized as PS one and alternatively spelled PSOne and PSone) is a smaller, redesigned version of the original PlayStation platform. (Dimensions are 38 mm × 193 mm × 144 mm versus 45 mm × 260 mm × 185 mm.) It was released on 7 July 2000, and went on to outsell all other consoles throughout the remainder of the year—including Sony's own PlayStation 2. The PS One is fully compatible with all PlayStation software; compatibility with certain peripherals may vary, however. The PS One also had additional changes, including the removal of the parallel and serial ports from the rear of the console, and the removal of a separate reset button (the power button is also labeled as a reset button, executed by double-pressing the switch in quick succession).
On 2 January 2002, Sony released a bundle set called the Combo that included a 5-inch (130 mm) LCD screen attachment (SCPH-131) which was initially offered as a separate attachment for the PS One on 19 September 2000. The screen itself included built-in stereo speakers, volume and brightness controls, passthrough ports for power and AV outputs and had a headphone jack as well as an AV mini jack for connecting camcorders or other devices.