Today’s big tech news might be the fancy-looking Surface Studio PC, but Microsoft also decided to make a major virtual reality announcement during its Windows event: a whole new line of VR headsets with built-in tracking sensors, starting at the surprisingly low price of $299.

Manufactured by Microsoft partners like Asus, Acer, Lenovo, HP, and Dell, the headsets were shown briefly, and in little detail. But we saw just enough to raise a lot of questions about how they’ll actually work — and what they’ll mean for virtual reality.

What is…

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