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

BBC: Hands-free mobiles given safety boost

Ericsson made some interesting accessories for the T28, like the "CHA-10 Chatboard" (a QWERTY keyboard for text messaging), the "MP3 hands-free kit HPM-10" (an MP3 player with an MMC card slot and standard 3.5mm headphone jack) and the aforementioned "Bluetooth phone adapter DBA-10".

ENGADGET: Ericsson T28z review Mobile

This announcement follows the recent release of the TomTom Hands-free Car Kit for Smartphones.

ENGADGET: TomTom bringing its navigation app to Android in October, keeping mum on the details