[http://www.blogcdn.com/www.engadget.com/media/2011/10/pic2011-01-27eng.jpg](http://www.engadget.com/2011/10/11/asus-zenbook-ux21-and-ux31-headed-to-the-us-october-12-starting/)
Back in May, when we first got hands-on with ASUS' [UX21](http://www.engadget.com/2011/05/30/asus-outs-ux21-ultrathin-laptop-with-up-to-core-i7-cpu-video-ha/) and [UX31](http://www.engadget.com/2011/09/13/asus-ux31-vs-ux21-fight-video/) laptops, it was to be one of our first encounters with the kind of ultrathin PC that Intel's now marketing as Ultrabooks. Since then, a lot's happened -- we've seen a handful of [similarly](http://www.engadget.com/2011/09/01/toshibas-portege-z830-is-an-ultraslim-ultrasexy-ultrabook/) [skinny](http://www.engadget.com/2011/09/01/lenovo-announces-u300s-ultrabook-u300-and-u400-ideapads-we-go/) notebooks, with [Acer's Aspire S3](http://www.engadget.com/2011/10/10/acer-aspire-ultrabook-s3-hits-the-us-and-canada-this-week-start/) beating them all to market. Now, more or less on schedule, ASUS is ready to follow suit. The company just announced that its line of Ultrabooks -- make that [Zenbooks](http://www.engadget.com/2011/10/07/asus-ultrabooks-are-actually-zenbooks/)! -- will go on sale in the US tomorrow, October 12, starting at $999 for the 11.6-inch UX21 and $1,099 for the 13.3-inch UX31. That's a hundred bucks than the S3, but then again, that guy has an HDD combined with a small amount of flash storage.
If you'll recall, they weigh in at 2.4 pounds and 2.9 pounds, respectively, and thanks to those aluminum alloy bodies, glass trackpads and all-metal keyboards, they just happen to be two of the finest-looking Ultrabooks we've seen to date. Other specs include 4GB of RAM, USB 3.0, Bluetooth 4.0, a SATA III SSD (starting at 128GB), stereo speakers with Bang and Olfusen's ICEpower technology, ultra low voltage Core i5 and i7 processors and a two-second resume time -- the same claim Acer's making with its Aspire S3. While the 11-incher has 1366 x 768 resolution, the 13-inch model's panel steps up to 1600 x 900. And when it comes to battery life, the UX21's rated for five hours of runtime (or seven days' standby), while the UX31 lasts a longer seven hours (or ten days) on a charge.
All told, there will be two UX21 configurations and three UX31 models, with the highest-end UX31 fetching $1,449 and packing a 256GB of solid-state storage. You heard the company -- these are landing tomorrow -- but until then feel free to revisit our [hands-on](http://www.engadget.com/2011/05/30/asus-outs-ux21-ultrathin-laptop-with-up-to-core-i7-cpu-video-ha/) for your requisite close-up shots and video.
**Gallery: [Asus Zenbook](http://www.engadget.com/photos/asus-zen-book/)**
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ASUS Zenbook UX21 and UX31 headed to the US October 12, starting at $999 originally appeared on Engadget on Tue, 11 Oct 2011 14:17:00 EDT. Please see our terms for use of feeds.
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