The original model did not have level controls or a power switch.
He was smart enough to hand it to her, and hit the power switch.
The controls, including the power switch, are at the bottom and also hard to see.
Other models come with a power switch, which must be held during operation.
Then he held his breath, and turned the main power switch.
Tom set up his control board alongside, with the main power switch within easy reach.
Her husband reached toward the power switch for the monitor.
Then he opened the power switch and turned the room lights back on.
"It doesn't do anything when I hit the power switch."
He found its power switch by touch and turned it on.