When it comes to Bluetooth, I don't know what's lamer—looking like you are talking to yourself or talking into your wrist. If you chose the former, Adtec has a device for you.
For the equivalent of $US65, users can have a wristband that connects to their mobile phone via Bluetooth, complete with speaker, volume control and a call answer button. Battery life is said to be around five hours and it is available in either white or grey. Seriously though, if you are going to make a Bluetooth wristband that actually communicates, have the decency to put an actual watch on there. Even a tiny digital display would suffice. [Adtec via Impress via DVICE via Crunchgear]