[cjbgkagh]

Ultrasonic knives are used commercially, this is an attempt at a mass market by making it cheaper and packaging it in a more familiar form.

[ars]

They also make one for home use: https://www.amazon.com/dp/B0FK9SB5KR

HOZO NeoBlade Wireless Ultrasonic Cutter

It's from a kickstarter.