Microsoft is adding another device to its Surface tablet line, debuting a new lightweight model on Tuesday called the Surface 3.

The tablet, which boasts the same laptop-replacing features as its higher-end Surface Pro 3 sibling, starts at $499 and will go on sale in May. Microsoft notes that it is the company's thinnest and lightest tablet to date, but that it will also run "full Windows," including desktop applications. It has a full USB 3.0 port, a mini DisplayPort and a microSD card slot, as well as an optional dock in case you want to make it your computer at work.

The Surface 3 will also work with the company's signature Surface Pen. The pen will also now come in different colors -- silver, black, blue and red -- but is still sold separately. (So is the Surface's keyboard cover.)

Take a closer look at the Surface 3's features here:

The announcement is also notable because of what it doesn't mention -- anything about Windows RT, the operating system that Microsoft designed for tablets that used to count the lower-priced Surface as its main showcase device.

When Microsoft announced the Surface Pro 3 without a Windows RT counterpart last year, speculation flew that the operating system was on its way out. Tuesday's announcement seems to confirm that -- at least for now -- Microsoft isn't interested in making new RT devices.

The new tablet will run Windows 8.1 and will be eligible for a free upgrade to Windows 10 when the new operating system comes out. The Surface 3 will go on sale in the U.S. starting May 5, and expand to more international markets on May 7. If you want to try it before then, you can head to your nearest Microsoft store starting April 1 for a hands-on demo.