Satisfying nibbler tool

What is the operating principle of this tool?

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Very useful tool. Especially cutting through 1/2 sheet

Seen them in Lidl, but have to buy the charger & battery separate. Anyone tried them? Any good? Got a 240 volt jigsaw & reciprocating for cutting metal & wood. Reciprocating saw batteries failed, so linked up a mains power 19 volt 6 amp transformer box to make it work.

Creativity at its best 💪💯