They also found that the group using the hands-free kit made 83% more errors in their tasks than those who were not talking.

他们还发现，使用免提设备的小组在执行任务时比不使用免提设备的小组多犯83%的错误。

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The same thing happens if you talk on a mobile phone while driving – even legally with a hands-free kit.

同样地，如果你一边打电话一边开车的话——即便是使用了免提设施。

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The MEX-BT5000 acts as a hands free kit for any Bluetooth phone (although we're sure they'd prefer if it was one of their own), giving you access to up to 50 of your contacts and six of your speed dial entries through its "high resolution" screen and integrated noise-reducing micophone.

ENGADGET: Sony's MEX-BT5000 car stereo with Bluetooth

But when they connected the hands-free kit, they recorded a significant drop in SAR levels.

BBC: Hands-free mobiles given safety boost

The TomTom Hands Free Car Kit comes in two versions to support iPhone and micro USB compatible smartphones such as Android phones.

ENGADGET: TomTom launches new hands-free dashboard mount for smartphones (video)