The Good The affordable Logitech Wireless Speaker Adapter adds Bluetooth streaming capabilities to anything with an audio (auxiliary) input, or a pair of powered speakers. It includes an RCA-to-3.5mm cable.
The Bad It's "wireless," but needs to be plugged in to the audio component (and a wall outlet).
The Bottom Line If you're looking for a relatively cheap way to add Bluetooth wireless audio streaming to a powered speaker or audio component with an audio input, the Logitech Wireless Speaker Adapter is a good solution.
Logitech Wireless Speaker Adapter - Bluetooth wireless audio receiver
With all this talk of wireless audio streaming, you may have asked yourself how you might go about adding Bluetooth to an existing set of powered speakers or an iPod speaker dock for not too much money. Logitech's answer: the Wireless Speaker Adapter.
I can't say there's anything terribly fancy or thrilling about the product -- but it works.
The Wireless Adapter is about the size of anor streaming media box (or, if you prefer, a hockey puck). It has to be plugged into a wall socket to get its power.