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Both also have Dolby Home Theatre v4 support and offer a backlit AccuType keyboard.
With both devices offering largely the same specs, the key difference between them is screen size: the Z400 offers a 14-inch display where as the Z500 (pictured) has a 15.6-inch display. Whichever buyers opt for, the maximum resolution of the displays is 1600 x 900 pixels.
The Z400 will be available from March and the Z500 should go on sale in April, Lenovo said.