They switch on slowly, and they are reluctant to switch off.

它们启动缓慢，并且很难关闭。

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The engineers are also trying to develop an on-and-off "switch" where the glow would fade when exposed to daylight.

工程师们还试图研制一种间断式“开关”，当暴露在日光下时，光照会逐渐消失。

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Instead, for most people, it switches on and off like a light switch.

相反，对于大多数人来说，它就像开关一盏灯一样。

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If it all sounds too much, Mrs Kramlich points out that living with media art is really no different from living with fixed-image art. (The couple have works by Andy Warhol and Joseph Beuys in their mock-Tudor San Francisco home.) The difference, she adds with an eye to California's electricity troubles, is that you have an on-off switch and when the images vanish, the house is an artwork of its own.

ECONOMIST: Showing video art: The glasshouse effect | The

The screen can also be turned on and off using the switch, enabling one-touch operations.

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The earpiece has an on-off switch, a three-stage volume control and uses a rechargeable battery.

WSJ: Testing, Testing...Can You Hear Better Now?