SIGNIFICANT EDIT: My Motorola Bluetooth headphones are the models S805 (studio monitor type) and the S9 (the "active" headphone type, which you can using jogging, riding a bike, etc.). With their built-in headset controls both models can change volume with my Nokia N800, but will not apparently pause or advance to the next (or previous) tracks, as they will if I use the dongle with other dedicated mp3 players. (These models will also work with phone calls if you have a compatible phone, as they have built-in microphones.) So, you apparently do not get the full Motorola functionality when paired with the N800, but I haven't really experimented much further with the in-built controls.