Acer has unveiled the Aspire S5, an ultrabook that's just 15mm at its thickest point.

The 13.3in laptop is powered by Intel's upcoming Core processor code-named Ivy Bridge and benefits from Acer's Green Instant On technology that ensures the laptop can resume functionality in just 1.5 seconds. Furthermore, the laptops also features Acer Always Connect, which the company claims helps PC users get online quicker and even offers the ability to use a mobile device, such as a smartphone, to wake-up the ultrabook and access files stored on the PC.

Ultrabooks are a new category of thin and light laptops, which were introduced by Intel last year. The laptops, which are laptops under 20mm (0.8in) thick, "marry the performance and capabilities of today's laptops with tablet-like features" and are designed to offer a happy medium between laptops and tablets.

The Acer Aspire S5 has a curved chassis in Onyx Black and a magnesium-aluminium alloy cover. The laptop weighs 1.35Kg and also comes with a solid State Drive (SSD) for storage, a MagicFlip I/O port panel which is concealed just below the hinge and flips out to reveal to reveal a selection of I/O ports including HDMI, USB 3.0 and 20Gbps Thunderbolt, as well as Dolby Home Theatre speakers and a chiclet keyboard.

"The Ultrabook is much more than just a product segment," said Jim Wong, president of Acer.

"It's a new trend that will become the mainstream for mobile PCs, and customers will see the unique features gradually extended across Acer's notebook family."

The Acer Aspire S5 will be available from Q2 of 2012. Prices have not yet been made available.