Samsung's latest ultra-slim Ultrabook does something not done before: all-day battery life, 4G LTE, in one of the lightest designs to date. Too bad about that keyboard.

The tale of Windows 10 on ARM is an ever-evolving one with small, but significant advancements. The Samsung Galaxy Book S is the second PC to feature Qualcomm's Snapdragon 8cx ARM processor (the other being Microsoft's Surface Pro X).

Following a more traditional clamshell design, this always-connected 4G LTE computer brings back one of Qualcomm's main advantages over rival Intel: battery longevity in a super-slender design.