can you recommend a bluetooth 12V bluetooth receiver?

I'm wanting to plug in a 12V bluetooth receiver into the aux in on my WS420 and control the playlist from the top of a houseboat or the beach with the phone versus having to climb back into the boat. I'm not concerned with battery drain on the iPhone using bluetooth, just looking for something good that works at least 30ft. Is this possible and can anybody doing this recommend a product? I know there are several options for cars, but I'm guessing you have to be fairly close by proximitey-wise. How's the sound quality? I've not heard Bluetooth Audio yet. Do the receivers draw quite a bit? Thanks in advance.