The Sony PSP features a large 4.3-inch 16:9 widescreen LCD TFT screen with a 480x272 resolution, button layout similar to the PlayStation with a digital control pad, an analog stick, circle, square, triangle, x, and 2 shoulder buttons, USB 2.0 connectivity (via mini-USB), a Memory Stick Duo media slot, and 802.11b WiFi support. It uses Sony's proprietary Universal Media Disc, which stores up to 1.8GB in a format reminiscent of MiniDiscs. The Japanese launch release date was December 12th and the first shipment of PSPs quickly sold out.