Bluetoothify my current desk speakers?

I’ve been searching for a few minutes now and haven’t been very successful, I’ve come across 3.5mm bluetooth jacks but that isn’t what I’m looking for.

I came across this (http://www.mymemory.co.uk/Bluetooth-Speakers/Sony-Ericsson/Sony-Ericsson-Bluetooth-Music-Receiver-MBR——100)

but that is for a phone, a sony phone that I don’t have anyway, but I want to make my speakers run through bluetooth if I can, I know that there are speakers out there now that work through bluetooth, but I don’t want to buy new speakers, I have a logitech X-230 system that plugs in via a 3.5mm headphone jack, I just want to be able to walk around and actually use my laptop… as a laptop rather than having it stuck on my desk 24/7 to be able to listen to music from my speakers.