"The Sharp-made D4 uses Intel's Centrino Atom platform to run Windows Vista Home Premium SP1. It has a 1.33GHz Atom Z520 on board, along with 1GB of 533MHz DDR 2 memory and a 40GB 1.8in hard drive. The 188 x 84 x 25.9mm, 470g device sports a full Qwerty keyboard and a 5in, 1024 x 600 display. It has 802.11b/g Wi-Fi, Bluetooth 2.0+EDR and PHS network compatibility. PHS (Personal Handy-phone System) is the cellular technology Willcom's network uses. There's a two-megapixel camera on the back, a Micro SD card slot of storage expansion, a USB port for PC connectivity and an integrated TV tuner."