These are the principal features and pricing of the new "iPad" touchscreen tablet computer unveiled by Apple chief executive Steve Jobs here on Wednesday:

- about the size of a piece of paper, the iPad is 0.5 inches (1.3-cm) thick and weighs 1.5 pounds (0.7 kilograms). It has a color 9.7-inch (24.6-cm) LED-display screen that allows for viewing video in high-definition

- 16, 32 and 64 gigabytes of flash memory

- a 16-gigabyte Wi-Fi version will be available in late March worldwide for 499 dollars. The 32GB Wi-Fi model will cost 599 dollars while the 64GB Wi-Fi model will cost 699 dollars

- iPad models equipped with Wi-Fi and 3G will be available in late April in the United States and selected countries. The 16GB model will cost 629 dollars, the 32GB will cost 729 dollars and the 64GB model will cost 829 dollars

- battery life of up to 10 hours from a single charge

- runs almost all of the over 140,000 applications for the iPod Touch and iPhone available in Apple's App Store

- an online "iBookstore" to complement the iTunes music store. iPad syncs with iTunes so applications and content downloaded from the App Store, iTunes Store and iBookstore will be automatically synced to a user's iTunes library

- a virtual touchscreen keyboard and the ability to hook up an external physical keyboard

- iWork, a productivity suite of applications for creating presentations or working with spreadsheets and charts

- powered by A4, a next-generation chip which Apple said provides exceptional processor and graphics performance

- a Software Development Kit for iPad developers to create applications