There is no need to use the push button on the side of the PTV3000 unit to switch between Widi and Miracast modes.

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In order to fully exploit the sound potential of the HDVD 800 with any audio source, a rotary gain switch at the rear of the unit provides simple adaptation of the amplifier output to the audio input voltage.

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Running an AC unit without a low-pressure cutoff switch when it's colder than about 60 degrees might damage it, says Troy Gregory, president of Standard Heating and Air Conditioning.

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In the interests of simplifying the man-machine interface, the Lexus unit combines four buttons, one rocker switch and one compass controller, which is as delicate as a Norden bomb sight.

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Additionally, the system creates a sort of targeting reticule that appears over nearby cars, letting you know when you're perhaps driving a little too close. (That, of course, is when you have to switch from missiles to guns.) The head unit recently became available in Japan, and while there's no word on a release date or price in the US, hopefully it won't be long off.

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James Claire at First Capital Group, a unit of First Union in Charlotte, North Carolina, won't switch.

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