Plug In + Disconnect

'Unplug + Connect.' That's the slogan with which naviPlay markets its Bluetooth Stereo Headset for iPod.

This thing works with both your iPod and your mobile phone, switching from one to th'other when calls come in or end. Stick it on your head and you achieve a number of things at once:

1. You'll look like a dork;
2. You'll be completely oblivious to any sound, human or otherwise, around you;
3. Don't even THINK about going into traffic.

But the sellers are undeterred. 'Take it with you cycling,' they crow. Probably forgot to consult their lawyers.