Apple's iWatch device is due to go into production in July as the firm ramps up for a release in the autumn, according to reports.
Apple supplier Quanta is said to be readying itself to build the device, which is expected to have a 2.5in rectangular screen, a notable change from most previous rumours that had predicted a 1.5in circular display.
Reuters cited unnamed sources at Taiwanese firm Quanta as the basis for the latest update. The Wall Street Journal has also reported that its sources claim the device will come in multiple sizes, with around 10-15 million devices expected to ship.
The Wall Street Journal also claims that the device will have 10 sensors to track fitness and health data from the wearer.
Apple has long been expected to enter the smartwatch market, as rivals Samsung have already made their own forays into the area. Apple's CEO Tim Cook promised exciting new products are on their way from Apple in 2014, which many took to be signs that the iWatch was on its way.
Last year Apple also secured a trademark for the term iWatch, adding more fuel to suggest that the device is on its way.
Apple is also due to unveil its latest iPhone models in the autumn, with a larger-screen model among the new hardware expected from the firm as it continues to expand its portfolio.
Earlier this week the firm added a new, cheaper iMac to its desktop range, costing £899.
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