Apple's smartwatch collection will range in price from $349 to more than $10,000 (£230 to over £6,600) depending on the metals they are made from and the straps they are bought with.
The larger 42mm (1.7in) models of the Watch will cost about $50 more than than the 38mm (1.5in) versions in the lower-priced ranges.
Apple also revealed that the devices are due to go on sale on 24 April.
Rivals' smartwatches have only seen limited sales to date.
Apple's chief executive Tim Cook said the device would typically last owners 18 hours between charges, providing a day's worth of use.
The firm added that thousands of new apps had already been developed for the Watch ahead of it going on sale.
Facebook, Instagram, car pick-up service Uber and the Chinese messaging app WeChat are among those confirmed to have developed software for the device.
Apple also highlighted that its wrist-worn device could be used to make touchless payments and receive phone calls.
Other functions demonstrated by Apple included:
- using the Watch as a means to open a compatible hotel room as an alternative to a key card
- checking the name of a song via the app Shazam
- opening an internet-connected garage door
To provide many of its functions - including GPS tracking, receiving phone calls and transmitting messages - the Watch requires its owner to have an iPhone 5 or more recent Apple handset, limiting its potential audience.
Even so, one expert believes sales will be strong - at least initially.
"Apple will unquestionably sell millions of these watches because there's pent-up demand from the loyal super-fans who will buy almost any Apple product," said Ben Wood from the tech advisory firm CCS Insight.
"Even if this merely told the time they would deliver that first chunk of sales. But the challenge is how you get ordinary iPhone owners to buy the smartwatch, because to date consumers have been left wondering why they need them in their lives."
CCS Insight forecasts 20 million units will be sold by the end of this year - representing about 7% of the compatible iPhones currently in use.
However, other analysts range widely in their predictions, forecasting sales as low as eight million units to as high as 60 million in 2015.
(BBC)
