PC maker Asus is taking the Windows-Android hybrid concept to another level with a convertible laptop that can switch between the two operating systems with the click of an on-screen button.

The Asus Transformer Book Duet TD300 comes as a 13.3-inch notebook with a detachable keyboard, which when removed turns the device into a tablet. But unlike other PC convertibles, the new Asus product can switch between the Windows and Android OSes in either tablet or laptop mode.

By pressing an "OS Switch" button located on the screen, the product will alternate to the other operating system in five seconds. The device itself runs Intel's fourth-generation Haswell chip, and will arrive in late March with a starting price of $599 in the US.

The company also unveiled its series of Android handsets called Zenfones that will be released in this year's first quarter in markets outside the US. The Zenfones will come in 4in, 5in and 6in screen versions, and all use variants of Intel's latest Atom processor. Asus also introduced a Padfone mini device that can switch between a 4in phone and a 7in tablet.

Software on the phones will use Asus' new "Zen UI," an interface that incorporates more than 200 company-made enhancements.