We first came across uBeam's unusual wireless charging technology three years ago, at the All Things D Science Fair, where the fledgling company was only just introducing its creation to the public. Today, the company's finally ready for a big move forward -- uBeam co-founder Meredith Perry just announced that the team has created a fully functional prototype, one that will be used as a model for upcoming consumer versions. So, what makes uBeam so "unusual" anyway? Unlike other wireless charging standards that require you to place gadgets in contact with mats, uBeam's ultrasound-based technology allow you to move freely while charging. We're not talking about being able to charge phones merely two feet away from the mat: if the technology works as intended, you can actually move around the room while your device's battery gauge fills up.