Bought this online on http://us.kensington.com for $29.99. Good device, easy to set up and works great with my Windows Xp computer, as well as my Sony Ericsson phone. It works with most bluetooth devices: mobile phones, PDAs, mice, keyboards etc. It is also compatible with Mac computers.
It can link up to 7 bluetooth devices at once. It is a small white USB device that you can plug into the back of your computer and just forget about. It is fast, reliable and comes with the necessary software which is easy to install. It provides secure encrypted wireless networking with your bluetooth devices. It is extremely light: 0.32 lbs!
It has bluetooth version 2.0 on it, which I am told is three times faster than version 1.2 and has enhanced data Smart power management consumes as little as 1/5 the battery power of the 1.2 version. I do not fully understand what this is exactly but i do know that this is a great kensignton product!