SAN FRANCISCO (AP) — Another wave of laptop computers running on Google’s Chrome operating system will be hitting stores this summer in the latest challenge to Microsoft’s dominant Windows franchise.

The latest line of Chromebooks unveiled Tuesday run on a new generation of faster Intel microprocessors that don’t devour as much battery power. The machines will be shipped by major personal computer makers such as Lenovo Group, Acer, Dell, ASUS and Toshiba. They will sell for $300 to $400.