The original Wi-Fi only Apple iPad (1st Gen) -- heralded as a "magical and revolutionary" device -- is a tablet computer designed for "browsing the web, reading and sending e-mail, enjoying photos, watching videos, listening to music, playing games, reading e-books, and more".
It is equipped with a 9.7-inch (1024x768, 132 ppi) multitouch "glossy" LED-backlit IPS display.
It is powered by a custom-designed 1 GHz Apple A4 "system on a chip", has 16 GB, 32 GB, or 64 GB of flash memory, 802.11a/b/g/n Wi-Fi support, an accelerometer, ambient light sensor, digital compass, dual mono speakers and a built-in mic packed in a 0.5 inch thick, 1.5 pound glass and aluminum case.
Supported iOS Versions for iPad:
iPad 1 - iOS 5.1.1
iPad 2 | 3 | Mini 1 - iOS 9.3.5
iPad 4 - iOS 10.3.3
iPad Air 1 | Mini 2 | Mini 3 - iOS 12.x
Other models update to the current version of iOS