The drones of CES 2019 aren’t all in the air

LAS VEGAS—This year’s CES has brought about a welcome development in self-propelled robots: drones without the usual droning soundtrack.

That’s not because the electronics gathering features any fewer unmanned aerial vehicles lifted by spinning rotors that emit a characteristic and annoying whine.

That racket hasn’t gone anywhere, as heard from such models as the pocket-sized AirSelfie 2 (light enough to evade the Federal Aviation Administration’s drone-registration requirements) and Ataraina’s Flying Magic Cleaner (a sort of drone Roomba that sweeps up dust particles electrostatically).

But the drones that interested me were not those small flying robots.

Drones that go into the drink

Underwater drones have been around for a while for those looking to capture their visits to coral

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