Microsoft unveiled the first motion controllers for Windows Mixed Reality headsets, scheduled to debut this holiday from the company’s third-party hardware partners. The controllers will work without installing hardware on the walls, using sensors in headsets connected to Windows 10 PCs.

Acer will sell a virtual reality headset and motion controller together for $399 starting this holiday, the company says. Microsoft will announce the new devices at its Build conference in Seattle this morning.

It’s the latest expansion by Microsoft in the field of virtual and augmented reality. Its initiatives range from its own high-end HoloLens mixed-reality headsets to these lower-cost virtual reality headsets from Microsoft’s hardware partners. Alex Kipman, the Microsoft technical fellow in charge of HoloLens, is slated to be among the speakers at the Build keynote this morning, with new technology demos expected.

The company is also unveiling the next Windows 10 update this morning with new connections to iOS and Android. Follow along with the live stream and our live blog, and stay tuned for updates as the motion controllers are unveiled on stage.

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