Question regarding audio output on bluetooth...

I received a bluetooth speaker in the mail today (the Oontz). I connected it but the only options for the sound output are headset and headphones, which makes the sound really muffled. When I connect it to my boyfriend's MacBook Pro, there is an "audio device" output option, but I can't figure out how to set it up on my computer with that option! Please help 🙂

I have an older MacBook Pro that is running on Mac OS X 10.5.8.