The batteries are definitely not in the base https://youtu.be/7jldc-k3Blg?t=1248
Then they are doing a scheme like wireless charging (wired.com).
Or they got their hands on some transparent conductive material (newatlas.com) and hid it in the plexiglass, running wires through the metal table to the transparent conductive material.
>The Cota system delivers a few watts of power at close range but drops down to milliwatts with distance and stops being meaningful at around 30 feet. Efficiency is a thorny issue, as there’s a large discrepancy between the power you spend and the power you recover.
You're talking about charging a phone here, there's much more power involved with that engine than there's in charging 10 androids
They could easily do it with microwaves, but my money is on a transparent conductor through the plexiglass.
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