Judgment of plasma power which arcs, just look at the way the hand of the match with the torch cut whether there is button.

判断等离子电源属哪种起弧方式，只须看所配的手用割炬上是否有按钮即可。

youdao

The Pearl squished the keyboard and split the keys, the Storm went with a touchscreen that was also a giant button and the Torch opted for a sliding mechanism that was old hat for most other manufacturers.

ENGADGET

Virtually every morning, it seems, image-makers in the gainful employ of opposition leader Tony Abbott and Prime Minister Julia Gillard conjure up some kind of unimaginative photo-opportunity, where their leaders appear brandishing a blow-torch, a spade, a butcher's knife, an on-button or some kind of piece of light industrial machinery.

BBC: The scandal that could bring down Australia's government