Two years ago the 10.1-inch Transformer Book T100 was ASUS's first outing with a small-format 2-in-1 Windows notebook -- that is, a laptop with a screen that detaches to function as a tablet. The new Transformer Book T100HA updates the internal components and adds Windows 10 (Home), but it's not the rarity that the original T100 was: Windows 2-in-1s are now commonplace.
ASUS Transformer Book T100HA at ZDNet
ASUS Transformer Book T100HA at ZDNet