There are two models of the Surface, one with a low-energy processor featuring Windows RT, and another with an Intel processor featuring Windows 8 Pro.

Microsoft has released prices on only the RT version, which is already available for sale. The Intel version will come months later.

Here are the specs for both tablets:

—Windows RT version of Surface

Weight: About 1.5 lbs. (676 grams)

Thickness: 9.3 mm

Screen: 10.6 inches (diagonal) with ClearType HD Display

Connections: microSD, USB 2.0, Micro HD Video, 2x2 MIMO antennae (for wireless communications)

Storage options: 32 Gigabytes and 64 Gigabytes

Price: $499 for 32 GB version, $699 for 64 GB version.

Availability: Sales began Oct. 26 at Microsoft's stores and website.

Extras: Touch Cover, which has working, printed keyboard on inside surface but whose keys don't move when pushed, will cost $100 extra when purchased with the 32 GB version (It's $120 if bought separately). It's included with 64 GB version. Type Cover, with keys that move, costs $130.

— Windows 8 Pro version of Surface

Weight: About 2 lbs. (903 grams)

Thickness: 13.5 mm

Clear: 10.6 inches (diagonal) with ClearType Full HD Display

Connections: microSDXC, USB 3.0, Mini DisplayPort Video, 2x2 MIMO antennae (for wireless communications)

Storage options: 64 GB and 128 GB

Price: Not yet announced.

Availability: Not yet announced.